diff --git a/webapp/packages/plugin-object-viewer/src/ObjectViewerTabService.ts b/webapp/packages/plugin-object-viewer/src/ObjectViewerTabService.ts
index d0c490f284..8e76113ae7 100644
--- a/webapp/packages/plugin-object-viewer/src/ObjectViewerTabService.ts
+++ b/webapp/packages/plugin-object-viewer/src/ObjectViewerTabService.ts
@@ -67,6 +67,7 @@ export class ObjectViewerTabService {
       onSelect: this.selectObjectTab.bind(this),
       onClose: this.closeObjectTab.bind(this),
       canClose: this.canCloseObjectTab.bind(this),
+      onUnload: this.unloadObjectTab.bind(this),
 
       extensions: [
         projectProvider(this.getProject.bind(this)),
@@ -104,6 +105,11 @@ export class ObjectViewerTabService {
     });
   }
 
+  private async unloadObjectTab(tab: ITab<IObjectViewerTabState>) {
+    // TODO: we need to call unloadPages, but it's not implemented in the DBObjectPageService
+    await this.dbObjectPageService.closePages(tab);
+  }
+
   isPageActive(tab: ITab<IObjectViewerTabState>, page: ObjectPage): boolean {
     return tab.handlerState.pageId === page.key;
   }