diff --git a/LibCpp2IL/Metadata/Il2CppMetadata.cs b/LibCpp2IL/Metadata/Il2CppMetadata.cs
index 58139377..b5a389ed 100644
--- a/LibCpp2IL/Metadata/Il2CppMetadata.cs
+++ b/LibCpp2IL/Metadata/Il2CppMetadata.cs
@@ -420,7 +420,8 @@ private Il2CppMetadata(MemoryStream stream, UnityVersion unityVersion, float met
             foreach (var il2CppFieldDefaultValue in fieldDefaultValues)
             {
                 _fieldDefaultValueLookup[il2CppFieldDefaultValue.fieldIndex] = il2CppFieldDefaultValue;
-                _fieldDefaultLookupNew[GetFieldDefinitionFromIndex(il2CppFieldDefaultValue.fieldIndex)] = il2CppFieldDefaultValue;
+                if (il2CppFieldDefaultValue.fieldIndex.IsNonNull)
+                    _fieldDefaultLookupNew[GetFieldDefinitionFromIndex(il2CppFieldDefaultValue.fieldIndex)] = il2CppFieldDefaultValue;
             }
 
             LibLogger.VerboseNewline($"OK ({(DateTime.Now - start).TotalMilliseconds} ms)");
diff --git a/LibCpp2IL/Metadata/Il2CppVariableWidthIndex.cs b/LibCpp2IL/Metadata/Il2CppVariableWidthIndex.cs
index e4bb306b..ab9b3d7d 100644
--- a/LibCpp2IL/Metadata/Il2CppVariableWidthIndex.cs
+++ b/LibCpp2IL/Metadata/Il2CppVariableWidthIndex.cs
@@ -71,7 +71,10 @@ public static Il2CppVariableWidthIndex<T> Read(ClassReadingBinaryReader reader)
                     return Null;
                 return new(val2);
             case 4:
-                return new(reader.ReadInt32());
+                var val3 = reader.ReadInt32();
+                if (val3 == int.MaxValue)
+                    return Null;
+                return new(val3);
             default:
                 throw new Exception($"Invalid width {widthForThisTypeOnCurrentApplication} for Il2CppVariableWidthIndex of type {typeof(T)}.");
         }