diff --git a/src/components/Playground/Output/Preview/Render.tsx b/src/components/Playground/Output/Preview/Render.tsx
index ac37647..a09dfaa 100644
--- a/src/components/Playground/Output/Preview/Render.tsx
+++ b/src/components/Playground/Output/Preview/Render.tsx
@@ -58,15 +58,16 @@ const Render = ({ iframeKey, compiledCode, mobileMode = false }: RenderProps) =>
     }
 
     useEffect(() => {
-        if (isLoaded) {
-            iframeRef.current?.contentWindow?.postMessage(
-                {
-                    type: 'UPDATE',
-                    data: { compiledCode }
-                } as IMessage,
-                '*'
-            )
+        if (!isLoaded) {
+            return
         }
+        iframeRef.current?.contentWindow?.postMessage(
+            {
+                type: 'UPDATE',
+                data: { compiledCode }
+            } as IMessage,
+            '*'
+        )
     }, [isLoaded, compiledCode])
 
     return mobileMode ? (
diff --git a/src/components/Playground/Output/Preview/Simulation.tsx b/src/components/Playground/Output/Preview/Simulation.tsx
index 3e41137..1164644 100644
--- a/src/components/Playground/Output/Preview/Simulation.tsx
+++ b/src/components/Playground/Output/Preview/Simulation.tsx
@@ -38,7 +38,7 @@ const Simulation = ({ data }: NodeProps<SimulationNode>) => {
                     ref={data.iframeRef}
                     src={data.iframeUrl}
                     onLoad={() => data.setIsLoaded(true)}
-                    sandbox="allow-downloads allow-forms allow-modals allow-scripts"
+                    sandbox={'allow-downloads allow-forms allow-modals allow-scripts'}
                     allow={'clipboard-read; clipboard-write'}
                 />
             </div>