diff --git a/packages/applet-view/src/avoutputarea.ts b/packages/applet-view/src/avoutputarea.ts
index 94524ad..9ab19e6 100644
--- a/packages/applet-view/src/avoutputarea.ts
+++ b/packages/applet-view/src/avoutputarea.ts
@@ -409,9 +409,9 @@ export class AppletViewOutputArea extends AccordionPanel {
     // clear applets
     this._applets = [];
     if (this.layout) {
-      (this.layout as PanelLayout).widgets.forEach((widget: Widget) =>
-        this.layout?.removeWidget(widget)
-      );
+      // we need a copy, as forEach does not work, if an item is removed
+      const widgetCopy = [...(this.layout as PanelLayout).widgets];
+      widgetCopy.forEach((widget: Widget) => this.layout?.removeWidget(widget));
     }
 
     if (applets.length === 0) {