diff --git a/toolbar/hermes_bridge.shelf b/toolbar/hermes_bridge.shelf
index 4855ca4..01c4f75 100644
--- a/toolbar/hermes_bridge.shelf
+++ b/toolbar/hermes_bridge.shelf
@@ -124,12 +124,18 @@ class HermesBridgeWindow(QtWidgets.QWidget):
             f"on {self.hostname} (port {self.port}).")
 
     def _toggle(self):
-        if bridge_is_open(self.port):
-            hou.hscript(f"closeport {self.port}")
-        else:
-            hou.hscript(f"closeport {self.port}")
-            hou.hscript(f"openport {self.port} 0.0.0.0")
-        self._refresh()
+        try:
+            if bridge_is_open(self.port):
+                hou.hscript(f"closeport {self.port}")
+            else:
+                hou.hscript(f"closeport {self.port}")
+                hou.hscript(f"openport {self.port} 0.0.0.0")
+            self._refresh()
+        except Exception as e:
+            hou.ui.displayMessage(
+                f"Toggle failed: {e}",
+                severity=hou.severityType.Error,
+                title="Hermes Bridge")
 
     def _on_port_changed(self, value):
         was_open = bridge_is_open(self.port)