Fix to add session only after kernel validation

jupyter · Jan 12, 2022 · 30732b2 · 30732b2
1 parent 85f1b9f
commit 30732b2
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/notebook/services/kernels/handlers.py b/notebook/services/kernels/handlers.py
@@ -251,7 +251,8 @@ def _register_session(self):
         if stale_handler:
             self.log.warning("Replacing stale connection: %s", self.session_key)
             yield stale_handler.close()
-        self._open_sessions[self.session_key] = self
+        if self.kernel_id in self.kernel_manager:  # only update open sessions if kernel is actively managed
+            self._open_sessions[self.session_key] = self
 
     def open(self, kernel_id):
         super(ZMQChannelsHandler, self).open()