diff --git a/flow-server/src/main/resources/com/vaadin/flow/server/webcomponent/webcomponent-script-template.js b/flow-server/src/main/resources/com/vaadin/flow/server/webcomponent/webcomponent-script-template.js
index 101455d3c88..bc112e3e400 100644
--- a/flow-server/src/main/resources/com/vaadin/flow/server/webcomponent/webcomponent-script-template.js
+++ b/flow-server/src/main/resources/com/vaadin/flow/server/webcomponent/webcomponent-script-template.js
@@ -125,7 +125,7 @@ _ThemeImport_class _TagCamel_ extends HTMLElement {
     return Object.values(clients).find(client => client.exportedWebComponents && client.exportedWebComponents.indexOf('_TagDash_') != -1)
   }
   disconnectedCallback() {
-    this.$server.disconnected();
+    this.$server && this.$server.disconnected();
 
     console.debug("disconnected", this);
   }