diff --git a/src/app/playground/page.tsx b/src/app/playground/page.tsx
index 506252b..ff002fe 100644
--- a/src/app/playground/page.tsx
+++ b/src/app/playground/page.tsx
@@ -117,15 +117,17 @@ export default function PlaygroundPage() {
         options={{ automaticLayout: true }}
         onMount={(editor) => {
           editorRef.current = editor;
-          const model = editorRef.current.getModel();
-          if (model) {
-            const lineCount = model.getLineCount();
-            const lastLineLength = model.getLineLength(lineCount);
-            editorRef.current.setPosition({
-              lineNumber: lineCount,
-              column: lastLineLength + 1,
-            });
-            editorRef.current.focus();
+          if (editorRef.current) {
+            const model = editorRef.current.getModel();
+            if (model) {
+              const lineCount = model.getLineCount();
+              const lastLineLength = model.getLineLength(lineCount);
+              editorRef.current.setPosition({
+                lineNumber: lineCount,
+                column: lastLineLength + 1,
+              });
+              editorRef.current.focus();
+            }
           }
         }}
       />