diff --git a/webui.dev/js/marshaller.js b/webui.dev/js/marshaller.js
index ebd8d5f..b578197 100644
--- a/webui.dev/js/marshaller.js
+++ b/webui.dev/js/marshaller.js
@@ -54,6 +54,10 @@ function onExecutionFinished (evt) {
 
   const actionButton = window.actionButtons[logEntry.actionTitle]
 
+  if (actionButton === undefined) {
+    return
+  }
+
   switch (actionButton.popupOnStart) {
     case 'execution-button':
       document.querySelector('execution-button#execution-' + logEntry.executionTrackingId).onExecutionFinished(logEntry)