diff --git a/Projects/TerraTech/TerraTech/ModuleShieldGeneratorManager.cs b/Projects/TerraTech/TerraTech/ModuleShieldGeneratorManager.cs
index 4b68518..736a344 100644
--- a/Projects/TerraTech/TerraTech/ModuleShieldGeneratorManager.cs
+++ b/Projects/TerraTech/TerraTech/ModuleShieldGeneratorManager.cs
@@ -14,23 +14,61 @@ namespace TerraTech {
             this.fieldName = fieldName;
             this.multiplier = multiplier;
             this.parentTraverse = parentTraverse;
+
+            if (!parentTraverse.Field(fieldName).FieldExists()) {
+                throw new ArgumentException($"Field {fieldName} does not exist on {parentTraverse.ToString()}");
+            }
         }
 
-        public TValue GetValue() => (TValue)parentTraverse.Field(fieldName).GetValue();
-        public void SetValue(TValue value) => parentTraverse.Field(fieldName).SetValue(value);
-        public void CaptureOriginal() => originalValue = GetValue();
-        public void Restore() => SetValue(originalValue);
+        public TValue GetValue() {
+            var value = parentTraverse.Field(fieldName).GetValue();
+            if (value == null)
+                throw new InvalidOperationException($"Field {fieldName} returned null");
+            return (TValue)value;
+        }
+
+        public void SetValue(TValue value) {
+            if (value == null)
+                throw new ArgumentNullException(nameof(value));
+            parentTraverse.Field(fieldName).SetValue(value);
+            var verifyValue = GetValue();
+            if (!verifyValue.Equals(value))
+                throw new InvalidOperationException($"Field {fieldName} set to {value} but read back as {verifyValue}");
+        }
+
+        public void CaptureOriginal() {
+            originalValue = GetValue();
+            if (Main.debug.Value)
+                Console.WriteLine($"Captured original value for {fieldName}: {originalValue}");
+        }
 
         public void Apply() {
-            dynamic originalDynamic = originalValue;
-            dynamic multiplierDynamic = multiplier.Value;
-            SetValue((TValue)(originalDynamic * multiplierDynamic));
+            try {
+                dynamic originalDynamic = originalValue;
+                dynamic multiplierDynamic = multiplier.Value;
+                var newValue = (TValue)(originalDynamic * multiplierDynamic);
+
+                if (Main.debug.Value)
+                    Console.WriteLine($"Applying to {fieldName}: {originalValue} * {multiplier.Value} = {newValue}");
+
+                SetValue(newValue);
+            } catch (Exception e) {
+                throw new InvalidOperationException($"Failed to apply multiplication to {fieldName}", e);
+            }
+        }
+
+        public void Restore() {
+            if (Main.debug.Value)
+                Console.WriteLine($"Restoring {fieldName} to original value: {originalValue}");
+            SetValue(originalValue);
         }
 
         public void LogValue(string prefix) {
             if (!Main.debug.Value)
                 return;
-            Console.WriteLine("{0} {1}; {2}: {3}", prefix, parentTraverse.ToString(), fieldName, GetValue());
+            var currentValue = GetValue();
+            Console.WriteLine(
+                $"{prefix} {parentTraverse}; {fieldName}: {currentValue} (original: {originalValue}, multiplier: {multiplier.Value})");
         }
     }
 
@@ -98,15 +136,8 @@ namespace TerraTech {
             }
         }
 
-        private void ApplyTo(T instance) {
-            if (managedObjects.TryGetValue(instance, out var obj))
-                obj.ApplyTo();
-        }
-
-        private void RestoreTo(T instance) {
-            if (managedObjects.TryGetValue(instance, out var obj))
-                obj.RestoreTo();
-        }
+        private void ApplyTo(T instance) if (managedObjects.TryGetValue(instance, out var obj)) obj.ApplyTo();
+        private void RestoreTo(T instance) if (managedObjects.TryGetValue(instance, out var obj)) obj.RestoreTo();
     }
 
     [HarmonyPatch]