diff --git a/src/Mass/Mass.cpp b/src/Mass/Mass.cpp
index 63f8c53..18b4b4e 100644
--- a/src/Mass/Mass.cpp
+++ b/src/Mass/Mass.cpp
@@ -147,6 +147,11 @@ void Mass::refreshValues() {
             return;
         }
 
+        if(frame_styles->items.size() != 4) {
+            _state = State::Invalid;
+            return;
+        }
+
         for(UnsignedInt i = 0; i < 4; i++) {
             _frame.styles[i] = frame_styles->at<IntProperty>(i)->value;
         }
@@ -169,6 +174,11 @@ void Mass::refreshValues() {
             return;
         }
 
+        if(frame_styles->items.size() != 16) {
+            _state = State::Invalid;
+            return;
+        }
+
         for(UnsignedInt i = 0; i < frame_styles->items.size(); i++) {
             auto style_prop = frame_styles->at<GenericStructProperty>(i);
 
@@ -205,6 +215,11 @@ void Mass::refreshValues() {
             return;
         }
 
+        if(armour_styles->items.size() != 16) {
+            _state = State::Invalid;
+            return;
+        }
+
         for(UnsignedInt i = 0; i < armour_styles->items.size(); i++) {
             auto style_prop = armour_styles->at<GenericStructProperty>(i);
 
@@ -241,6 +256,11 @@ void Mass::refreshValues() {
             return;
         }
 
+        if(global_styles->items.size() != 16) {
+            _state = State::Invalid;
+            return;
+        }
+
         for(UnsignedInt i = 0; i < global_styles->items.size(); i++) {
             auto style_prop = global_styles->at<GenericStructProperty>(i);