diff --git a/src/Mass/Mass.cpp b/src/Mass/Mass.cpp
index 3966e9c..a1a8109 100644
--- a/src/Mass/Mass.cpp
+++ b/src/Mass/Mass.cpp
@@ -18,6 +18,7 @@
 
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/Pair.h>
+#include <Corrade/Containers/ScopeGuard.h>
 #include <Corrade/Utility/Path.h>
 
 #include "../UESaveFile/Types/ArrayProperty.h"
@@ -79,7 +80,12 @@ auto Mass::getNameFromFile(Containers::StringView path) -> Containers::Optional<
 }
 
 void Mass::refreshValues() {
+    Utility::Debug{} << "=Refreshing values for" << _filename << Utility::Debug::nospace << "=";
+
+    Containers::ScopeGuard guard{[]{ Utility::Error{} << "Refresh failed."; }};
+
     if(!Utility::Path::exists(Utility::Path::join(_folder, _filename))) {
+        Utility::Warning{} << _filename << "does not exist in" << _folder;
         _state = State::Empty;
         return;
     }
@@ -87,12 +93,14 @@ void Mass::refreshValues() {
     if(!_mass) {
         _mass.emplace(Utility::Path::join(_folder, _filename));
         if(!_mass->valid()) {
+            Utility::Error{} << _mass->lastError();
             _state = State::Invalid;
             return;
         }
     }
     else {
         if(!_mass->reloadData()) {
+            Utility::Error{} << _mass->lastError();
             _state = State::Invalid;
             return;
         }
@@ -100,6 +108,7 @@ void Mass::refreshValues() {
 
     auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
+        Utility::Error{} << "Couldn't find unit data in" << _filename;
         _state = State::Invalid;
         return;
     }
@@ -107,6 +116,7 @@ void Mass::refreshValues() {
     auto name_prop = unit_data->at<StringProperty>("Name_45_A037C5D54E53456407BDF091344529BB"_s);
 
     if(!name_prop) {
+        Utility::Error{} << "Couldn't find a M.A.S.S. name in" << _filename;
         _name = Containers::NullOpt;
         _state = State::Invalid;
         return;
@@ -191,12 +201,16 @@ void Mass::refreshValues() {
 
     auto account_prop = _mass->at<StringProperty>("Account"_s);
     if(!account_prop) {
+        Utility::Error{} << "Couldn't find an account ID in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     _account = account_prop->value;
 
+    guard.release();
+    guard = Containers::ScopeGuard{[]{Utility::Debug{} << "Refresh successful.";}};
+
     _state = State::Valid;
 }
 
@@ -317,6 +331,7 @@ void Mass::getTuningCategory(Containers::StringView big_node_prop_name, Int& big
 {
     auto node_id = _mass->at<IntProperty>(big_node_prop_name);
     if(!node_id) {
+        Utility::Error{} << "Couldn't find" << big_node_prop_name << "in" << _filename;
         _state = State::Invalid;
         return;
     }
@@ -324,11 +339,13 @@ void Mass::getTuningCategory(Containers::StringView big_node_prop_name, Int& big
 
     auto node_ids = _mass->at<ArrayProperty>(small_nodes_prop_name);
     if(!node_ids) {
+        Utility::Error{} << "Couldn't find" << small_nodes_prop_name << "in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     if(node_ids->items.size() != small_nodes_ids.size()) {
+        Utility::Error{} << "Node ID arrays are not of the same size. Expected" << small_nodes_ids.size() << Utility::Debug::nospace << ", got" << node_ids->items.size() << "instead.";
         _state = State::Invalid;
         return;
     }
diff --git a/src/Mass/Mass_Armour.cpp b/src/Mass/Mass_Armour.cpp
index f7b4ad2..d290d37 100644
--- a/src/Mass/Mass_Armour.cpp
+++ b/src/Mass/Mass_Armour.cpp
@@ -34,17 +34,20 @@ auto Mass::armourParts() -> Containers::ArrayView<ArmourPart> {
 void Mass::getArmourParts() {
     auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
+        Utility::Error{} << "Couldn't find unit data in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     auto armour_array = unit_data->at<ArrayProperty>("Armor_10_12E266C44116DDAF57E99ABB575A4B3C"_s);
     if(!armour_array) {
+        Utility::Error{} << "Couldn't find the armour parts array in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     if(armour_array->items.size() != _armour.parts.size()) {
+        Utility::Error{} << "Armour arrays are not of the same size. Expected" << _armour.parts.size() << Utility::Debug::nospace << ", got" << armour_array->items.size() << "instead.";
         _state = State::Invalid;
         return;
     }
@@ -66,11 +69,13 @@ void Mass::getArmourParts() {
 
         auto part_styles = part_prop->at<ArrayProperty>("Styles_47_3E31870441DFD7DB8BEE5C85C26B365B"_s);
         if(!part_styles) {
+            Utility::Error{} << "Part styles not found for part number" << i << "in" << _filename;
             _state = State::Invalid;
             return;
         }
 
         if(part_styles->items.size() != part.styles.size()) {
+            Utility::Error{} << "Part style arrays are not of the same size. Expected" << part.styles.size() << Utility::Debug::nospace << ", got" << part_styles->items.size() << "instead.";
             _state = State::Invalid;
             return;
         }
@@ -81,6 +86,7 @@ void Mass::getArmourParts() {
 
         auto decals_array = part_prop->at<ArrayProperty>("Decals_42_F358794A4F18497970F56BA9627D3603"_s);
         if(!decals_array) {
+            Utility::Error{} << "Part decals not found for part number" << i << "in" << _filename;
             _state = State::Invalid;
             return;
         }
@@ -91,6 +97,7 @@ void Mass::getArmourParts() {
 
         auto accs_array = part_prop->at<ArrayProperty>("Accessories_52_D902DD4241FA0050C2529596255153F3"_s);
         if(!accs_array) {
+            Utility::Error{} << "Part accessories not found for part number" << i << "in" << _filename;
             part.accessories = Containers::Array<Accessory>{};
             continue;
         }
@@ -174,6 +181,7 @@ auto Mass::bulletLauncherAttachments() -> Containers::ArrayView<BulletLauncherAt
 void Mass::getBulletLauncherAttachments() {
     auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
+        Utility::Error{} << "Couldn't find unit data in" << _filename;
         _state = State::Invalid;
         return;
     }
@@ -188,6 +196,7 @@ void Mass::getBulletLauncherAttachments() {
 
     if(attach_style_prop && !attach_array) {
         _armour.blAttachmentStyle = BulletLauncherAttachmentStyle::NotFound;
+        Utility::Error{} << "Couldn't find bullet launcher attachments in" << _filename;
         _state = State::Invalid;
         return;
     }
@@ -335,17 +344,20 @@ auto Mass::armourCustomStyles() -> Containers::ArrayView<CustomStyle> {
 void Mass::getArmourCustomStyles() {
     auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
+        Utility::Error{} << "Couldn't find unit data in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     auto armour_styles = unit_data->at<ArrayProperty>("ArmorStyle_42_E2F6AC3647788CB366BD469B3B7E899E"_s);
     if(!armour_styles) {
+        Utility::Error{} << "Couldn't find custom armour styles in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     if(armour_styles->items.size() != _armour.customStyles.size()) {
+        Utility::Error{} << "Custom armour style arrays are not of the same size. Expected" << _armour.customStyles.size() << Utility::Debug::nospace << ", got" << armour_styles->items.size() << "instead.";
         _state = State::Invalid;
         return;
     }
diff --git a/src/Mass/Mass_DecalsAccessories.cpp b/src/Mass/Mass_DecalsAccessories.cpp
index ccdf17e..6f795c7 100644
--- a/src/Mass/Mass_DecalsAccessories.cpp
+++ b/src/Mass/Mass_DecalsAccessories.cpp
@@ -31,6 +31,7 @@ using namespace Containers::Literals;
 void Mass::getDecals(Containers::ArrayView<Decal> decals, ArrayProperty* decal_array) {
     for(UnsignedInt i = 0; i < decal_array->items.size(); i++) {
         auto decal_prop = decal_array->at<GenericStructProperty>(i);
+        CORRADE_INTERNAL_ASSERT(decal_prop);
         auto& decal = decals[i];
 
         decal.id = decal_prop->at<IntProperty>("ID_3_694C0B35404D8A3168AEC89026BC8CF9"_s)->value;
@@ -54,6 +55,7 @@ void Mass::getDecals(Containers::ArrayView<Decal> decals, ArrayProperty* decal_a
 void Mass::writeDecals(Containers::ArrayView<Decal> decals, ArrayProperty* decal_array) {
     for(UnsignedInt i = 0; i < decal_array->items.size(); i++) {
         auto decal_prop = decal_array->at<GenericStructProperty>(i);
+        CORRADE_INTERNAL_ASSERT(decal_prop);
         auto& decal = decals[i];
 
         decal_prop->at<IntProperty>("ID_3_694C0B35404D8A3168AEC89026BC8CF9"_s)->value = decal.id;
@@ -87,6 +89,7 @@ void Mass::writeDecals(Containers::ArrayView<Decal> decals, ArrayProperty* decal
 void Mass::getAccessories(Containers::ArrayView<Accessory> accessories, ArrayProperty* accessory_array) {
     for(UnsignedInt i = 0; i < accessory_array->items.size(); i++) {
         auto acc_prop = accessory_array->at<GenericStructProperty>(i);
+        CORRADE_INTERNAL_ASSERT(acc_prop);
         auto& accessory = accessories[i];
 
         accessory.attachIndex = acc_prop->at<IntProperty>("AttachIndex_2_4AFCF6024E4BA7426C6B9F80B8179D20"_s)->value;
@@ -111,6 +114,7 @@ void Mass::getAccessories(Containers::ArrayView<Accessory> accessories, ArrayPro
 void Mass::writeAccessories(Containers::ArrayView<Accessory> accessories, ArrayProperty* accs_array) {
     for(UnsignedInt i = 0; i < accs_array->items.size(); i++) {
         auto acc_prop = accs_array->at<GenericStructProperty>(i);
+        CORRADE_INTERNAL_ASSERT(acc_prop);
         auto& accessory = accessories[i];
 
         acc_prop->at<IntProperty>("AttachIndex_2_4AFCF6024E4BA7426C6B9F80B8179D20"_s)->value = accessory.attachIndex;
diff --git a/src/Mass/Mass_Frame.cpp b/src/Mass/Mass_Frame.cpp
index db8cb87..44f45f3 100644
--- a/src/Mass/Mass_Frame.cpp
+++ b/src/Mass/Mass_Frame.cpp
@@ -31,12 +31,14 @@ auto Mass::jointSliders() -> Joints& {
 void Mass::getJointSliders() {
     auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
+        Utility::Error{} << "Can't find unit data in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     auto frame_prop = unit_data->at<GenericStructProperty>("Frame_3_F92B0F6A44A15088AF7F41B9FF290653"_s);
     if(!frame_prop) {
+        Utility::Error{} << "Can't find frame data in" << _filename;
         _state = State::Invalid;
         return;
     }
@@ -179,23 +181,27 @@ auto Mass::frameStyles() -> Containers::ArrayView<Int> {
 void Mass::getFrameStyles() {
     auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
+        Utility::Error{} << "Can't find unit data in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     auto frame_prop = unit_data->at<GenericStructProperty>("Frame_3_F92B0F6A44A15088AF7F41B9FF290653"_s);
     if(!frame_prop) {
+        Utility::Error{} << "Can't find frame data in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     auto frame_styles = frame_prop->at<ArrayProperty>("Styles_32_00A3B3284B37F1E7819458844A20EB48"_s);
     if(!frame_styles) {
+        Utility::Error{} << "Can't find frame styles in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     if(frame_styles->items.size() != _frame.styles.size()) {
+        Utility::Error{} << "Frame style arrays are not of the same size. Expected" << _frame.styles.size() << Utility::Debug::nospace << ", got" << frame_styles->items.size() << "instead.";
         _state = State::Invalid;
         return;
     }
@@ -246,18 +252,21 @@ auto Mass::eyeFlareColour() -> Color4& {
 void Mass::getEyeFlareColour() {
     auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
+        Utility::Error{} << "Can't find unit data in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     auto frame_prop = unit_data->at<GenericStructProperty>("Frame_3_F92B0F6A44A15088AF7F41B9FF290653"_s);
     if(!frame_prop) {
+        Utility::Error{} << "Can't find frame data in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     auto eye_flare_prop = frame_prop->at<ColourStructProperty>("EyeFlareColor_36_AF79999C40FCA0E88A2F9A84488A38CA"_s);
     if(!eye_flare_prop) {
+        Utility::Error{} << "Can't find eye flare data in" << _filename;
         _state = State::Invalid;
         return;
     }
@@ -307,17 +316,20 @@ auto Mass::frameCustomStyles() -> Containers::ArrayView<CustomStyle> {
 void Mass::getFrameCustomStyles() {
     auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
+        Utility::Error{} << "Can't find unit data in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     auto frame_styles = unit_data->at<ArrayProperty>("FrameStyle_44_04A44C9440363CCEC5443D98BFAF22AA"_s);
     if(!frame_styles) {
+        Utility::Error{} << "Can't find frame styles in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     if(frame_styles->items.size() != _frame.customStyles.size()) {
+        Utility::Error{} << "Frame custom style arrays are not of the same size. Expected" << _frame.customStyles.size() << Utility::Debug::nospace << ", got" << frame_styles->items.size() << "instead.";
         _state = State::Invalid;
         return;
     }
diff --git a/src/Mass/Mass_Styles.cpp b/src/Mass/Mass_Styles.cpp
index 98f1c2c..0407f4d 100644
--- a/src/Mass/Mass_Styles.cpp
+++ b/src/Mass/Mass_Styles.cpp
@@ -32,6 +32,7 @@ auto Mass::globalStyles() -> Containers::ArrayView<CustomStyle> {
 void Mass::getGlobalStyles() {
     auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
+        Utility::Error{} << "Can't find unit data in" << _filename;
         _state = State::Invalid;
         return;
     }
diff --git a/src/Mass/Mass_Weapons.cpp b/src/Mass/Mass_Weapons.cpp
index 3eccadc..20a4d5c 100644
--- a/src/Mass/Mass_Weapons.cpp
+++ b/src/Mass/Mass_Weapons.cpp
@@ -101,17 +101,20 @@ auto Mass::writeEnergyLaunchers() -> bool {
 void Mass::getWeaponType(Containers::StringView prop_name, Containers::ArrayView<Weapon> weapon_array) {
     auto unit_data = _mass->at<GenericStructProperty>("UnitData"_s);
     if(!unit_data) {
+        Utility::Error{} << "Can't find unit data in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     auto prop = unit_data->at<ArrayProperty>(prop_name);
     if(!prop) {
+        Utility::Error{} << "Can't find" << prop_name << "in" << _filename;
         _state = State::Invalid;
         return;
     }
 
     if(prop->items.size() != weapon_array.size()) {
+        Utility::Error{} << "Weapon arrays are not of the same size. Expected" << weapon_array.size() << Utility::Debug::nospace << ", got" << prop->items.size() << "instead.";
         _state = State::Invalid;
         return;
     }
@@ -165,11 +168,13 @@ void Mass::getWeaponType(Containers::StringView prop_name, Containers::ArrayView
 
         auto custom_styles = weapon_prop->at<ArrayProperty>("Styles_10_8C3C82444B986AD7A99595AD4985912D"_s);
         if(!custom_styles) {
+            Utility::Error{} << "Can't find weapon custom styles in" << _filename;
             _state = State::Invalid;
             return;
         }
 
         if(custom_styles->items.size() != weapon.customStyles.size()) {
+            Utility::Error{} << "Weapon custom style arrays are not of the same size. Expected" << weapon.customStyles.size() << Utility::Debug::nospace << ", got" << custom_styles->items.size() << "instead.";
             _state = State::Invalid;
             return;
         }