diff --git a/src/panel/balloon/contextualballoon.js b/src/panel/balloon/contextualballoon.js
index 1f43c670..5f12c7d6 100644
--- a/src/panel/balloon/contextualballoon.js
+++ b/src/panel/balloon/contextualballoon.js
@@ -86,6 +86,12 @@ export default class ContextualBalloon extends Plugin {
 		this.editor.ui.focusTracker.add( this.view.element );
 	}
 
+	destroy() {
+		super.destroy();
+
+		// this._stack.clear();
+	}
+
 	/**
 	 * Returns the currently visible view or `null` when there are no
 	 * views in the stack.