Fix runReal

Author: Amar3tto

playground/frontend/playground_components/lib/src/controllers/code_runner.dart

@@ -140,9 +140,27 @@ class CodeRunner extends ChangeNotifier {
   }
 
   Future<void> _runReal() async {
-    final sdk = snippetEditingController!.sdk;
-    final parsedPipelineOptions =
-        parsePipelineOptions(snippetEditingController!.pipelineOptions);
+    // Capture once. Never use snippetEditingController! directly in async code.
+    final controller = snippetEditingController;
+    if (controller == null) {
+      return; // Nothing to run (widget disposed / controller cleared)
+    }
+
+    // Guard client (this is the typical null on Web Server).
+    final client = codeClient;
+    if (client == null) {
+      _setResult(
+        RunCodeResult(
+          errorMessage: kUnknownErrorText, // or a clearer message
+          sdk: controller.sdk,
+          status: RunCodeStatus.unknownError,
+        ),
+      );
+      return;
+    }
+
+    final sdk = controller.sdk;
+    final parsedPipelineOptions = parsePipelineOptions(controller.pipelineOptions);
     if (parsedPipelineOptions == null) {
       _setResult(
         RunCodeResult(
@@ -170,10 +188,11 @@ class CodeRunner extends ChangeNotifier {
       ),
     );
 
+    // Capture request inputs up front too (controller can change/dispose later).
     final request = RunCodeRequest(
-      datasets: snippetEditingController?.example?.datasets ?? [],
-      files: snippetEditingController!.getFiles(),
-      sdk: snippetEditingController!.sdk,
+      datasets: controller.example?.datasets ?? [],
+      files: controller.getFiles(),
+      sdk: sdk,
       pipelineOptions: parsedPipelineOptions,
     );
 
@@ -184,16 +203,15 @@ class CodeRunner extends ChangeNotifier {
         // Cancelled while trying to start.
         final pipelineUuid = runResponse?.pipelineUuid;
         if (pipelineUuid != null) {
-          await codeClient?.cancelExecution(pipelineUuid);
+          await client.cancelExecution(pipelineUuid);
         }
         return;
       }
 
       await Future.delayed(_statusCheckInterval);
 
       while (!_result!.isFinished) {
-        final statusResponse =
-            await codeClient!.checkStatus(runResponse.pipelineUuid);
+        final statusResponse = await client.checkStatus(runResponse.pipelineUuid);
 
         final result = await _getPipelineResult(
           runResponse.pipelineUuid,