initial commit

Author: the-higgs

jupyter_server/services/kernels/kernelmanager.py

@@ -179,7 +179,7 @@ async def start_kernel(self, kernel_id=None, path=None, **kwargs):
             The name identifying which kernel spec to launch. This is ignored if
             an existing kernel is returned, but it may be checked in the future.
         """
-        if kernel_id is None:
+        if kernel_id is None or kernel_id not in self:
             if path is not None:
                 kwargs['cwd'] = self.cwd_for_path(path)
             kernel_id = await ensure_async(self.pinned_superclass.start_kernel(self, **kwargs))