diff --git a/services/web/frontend/js/features/source-editor/extensions/bracket-matching.ts b/services/web/frontend/js/features/source-editor/extensions/bracket-matching.ts
index 17f000de6a..c14b144e6e 100644
--- a/services/web/frontend/js/features/source-editor/extensions/bracket-matching.ts
+++ b/services/web/frontend/js/features/source-editor/extensions/bracket-matching.ts
@@ -84,13 +84,13 @@ const chooseEventHandler = () => {
   }
 
   // Store and use the previous click event, as the "dblclick" event can have the wrong position
-  let lastClickEvent: MouseEvent
+  let lastClickEvent: MouseEvent | null = null
 
   return EditorView.domEventHandlers({
     click(evt, view) {
       if (evt.detail === 1) {
         lastClickEvent = evt
-      } else if (evt.detail === 2) {
+      } else if (evt.detail === 2 && lastClickEvent) {
         return handleDoubleClick(lastClickEvent, view)
       }
     },