diff --git a/src/vs/workbench/api/node/mainThreadEditorsTracker.ts b/src/vs/workbench/api/node/mainThreadEditorsTracker.ts
index e89a71a3592..af7668e2689 100644
--- a/src/vs/workbench/api/node/mainThreadEditorsTracker.ts
+++ b/src/vs/workbench/api/node/mainThreadEditorsTracker.ts
@@ -590,7 +590,7 @@ export class MainThreadEditorsTracker {
 
 		allCodeEditors.forEach((codeEditor) => {
 			let model = codeEditor.getModel();
-			if (!model || model.isTooLargeForHavingARichMode()) {
+			if (!model || model.isTooLargeForHavingARichMode() || !this._modelService.getModel(model.uri)) {
 				return;
 			}