From 1b326bd554fc35c486edeca47c1e7509b83cb6b9 2015-05-24 23:38:08
From: Matthias Bussonnier <bussonniermatthias@gmail.com>
Date: 2015-05-24 23:38:08
Subject: [PATCH] Merge pull request #8470 from takluyver/i8465

Fix quitting debugger when readline not in use
---

diff --git a/IPython/core/debugger.py b/IPython/core/debugger.py
index 5d34cf2..548f109 100644
--- a/IPython/core/debugger.py
+++ b/IPython/core/debugger.py
@@ -303,7 +303,8 @@ class Pdb(OldPdb):
             self.shell.Completer.all_completions=self.old_all_completions
 
         # Pdb sets readline delimiters, so set them back to our own
-        self.shell.readline.set_completer_delims(self.shell.readline_delims)
+        if self.shell.readline is not None:
+            self.shell.readline.set_completer_delims(self.shell.readline_delims)
 
         return OldPdb.do_quit(self, arg)