Does this fix it?

tony · tony · commit ed3d9ff40946 · 2020-10-31T16:33:16.000-05:00
diff --git a/tmuxp/cli.py b/tmuxp/cli.py
@@ -876,10 +876,7 @@ def command_shell_plus(
 
                     traceback.print_exc()
 
-        def run_plain():
-            code.interact(local=imported_objects)
-
-        run_plain()
+        code.interact(local=imported_objects)
 
 
 @cli.command(name='freeze')
