diff --git a/toolbar/hermes_bridge.shelf b/toolbar/hermes_bridge.shelf
index b2ad372..c93f503 100644
--- a/toolbar/hermes_bridge.shelf
+++ b/toolbar/hermes_bridge.shelf
@@ -129,6 +129,11 @@ class HermesBridgeWindow(QtWidgets.QWidget):
             f"on {self.hostname} (port {self.port}).")
 
     def _toggle(self):
+        # Defer to next event loop cycle — avoids re-entrancy
+        # issues with hou.hscript in signal handler context
+        QtCore.QTimer.singleShot(0, self._execute_toggle)
+
+    def _execute_toggle(self):
         try:
             if bridge_is_open(self.port):
                 hou.hscript(f"closeport {self.port}")