Merged pull request #2 from collective/master.

maurits fix

Author: gotcha

HISTORY.txt

@@ -4,7 +4,8 @@ Changelog
 0.4 (unreleased)
 ----------------
 
-- Nothing changed yet.
+- Fixed post_mortem when the traceback is None.
+  [maurits]
 
 
 0.3 (2011-01-16)

ipdb/__init__.py

@@ -17,6 +17,8 @@ def post_mortem(tb):
     def_colors = ip.options.colors
     p = Pdb(def_colors)
     p.reset()
+    if tb is None:
+        return
     while tb.tb_next is not None:
         tb = tb.tb_next
     p.interaction(tb.tb_frame, tb)