Got the if condition backwards....

Author: Golf Player

nbclient/util.py

@@ -94,9 +94,9 @@ async def ensure_async(obj):
 def run_hook(hook, *args):
     if hook is None:
         return
-    if inspect.isawaitable(hook):
+    if not inspect.isawaitable(hook):
+        future = hook(*args)
+    else:
         loop = asyncio.get_event_loop()
         future = loop.run_in_executor(None, hook, *args)
-    else:
-        future = hook(*args)
     asyncio.ensure_future(future)