Don't make stopForceRenderingAbove create the widget.

src/vs/base/common/async.ts

@@ -977,6 +977,10 @@ export class IdleValue<T> {
 		}
 		return this._value!;
 	}
+
+	get isInitialized(): boolean {
+		return this._didRun;
+	}
 }
 
 //#endregion

src/vs/editor/contrib/suggest/suggestController.ts

@@ -593,6 +593,10 @@ export class SuggestController implements IEditorContribution {
 	}
 
 	stopForceRenderingAbove() {
+		if (!this.widget.isInitialized) {
+			// This method has no effect if the widget is not initialized yet.
+			return;
+		}
 		this.widget.value.stopForceRenderingAbove();
 	}
 }