diff --git a/extension.js b/extension.js
index 474107b..27ac366 100644
--- a/extension.js
+++ b/extension.js
@@ -800,6 +800,7 @@ class GenericMonitorDBUS {
         }
         this.monitor_groups = {};
         this._dbusImpl.unexport();
+        this._dbusImpl = null;
     }
 }
 
diff --git a/metadata.json b/metadata.json
index 3de12ce..6a8ced9 100644
--- a/metadata.json
+++ b/metadata.json
@@ -2,8 +2,9 @@
     "uuid": "generic-monitor@gnome-shell-extensions",
     "name": "Generic Monitor",
     "description": "Display text & icon on systray using DBUS",
-    "version": "20",
+    "version": "21",
     "shell-version": [
+	"50",
 	"49"
     ],
     "url": "https://forge.soutade.fr/soutade/GnomeShellGenericMonitor"