Merge pull request #5204 from impact27/patch-8

PR: Fix calling pdb.pm() in a console

Author: ccordoba12

Diff for: spyder/utils/site/sitecustomize.py

@@ -437,15 +437,15 @@ def user_return(self, frame, return_value):
 
 @monkeypatch_method(pdb.Pdb, 'Pdb')
 def interaction(self, frame, traceback):
-    if "sitecustomize.py" not in frame.f_code.co_filename:
+    if frame is not None and "sitecustomize.py" in frame.f_code.co_filename:
+        self.run('exit')
+    else:
         self.setup(frame, traceback)
         if self.send_initial_notification:
             self.notify_spyder(frame)
         self.print_stack_entry(self.stack[self.curindex])
         self._cmdloop()
         self.forget()
-    else:
-        self.run('exit')
 
 
 @monkeypatch_method(pdb.Pdb, 'Pdb')