diff --git a/linedance-app/local/file_watcher.py b/linedance-app/local/file_watcher.py
index 3f34a839..110c3b06 100644
--- a/linedance-app/local/file_watcher.py
+++ b/linedance-app/local/file_watcher.py
@@ -163,9 +163,18 @@ class LibraryWatcher:
 
     def stop(self):
         if self._observer and self._running:
-            self._observer.stop()
-            self._observer.join()
             self._running = False
+            # Stop i baggrundstråd så GUI ikke hænger
+            obs = self._observer
+            self._observer = None
+            def _stop():
+                try:
+                    obs.stop()
+                    obs.join(timeout=3)
+                except Exception:
+                    pass
+            import threading
+            threading.Thread(target=_stop, daemon=True).start()
 
     def add_library(self, path: str) -> int:
         """Tilføj et nyt bibliotek — alt kører i baggrundstråd."""