--- a/Plugins/CheckerPlugins/Pep8/Pep8Dialog.py	Mon Aug 12 19:41:53 2013 +0200
+++ b/Plugins/CheckerPlugins/Pep8/Pep8Dialog.py	Mon Aug 12 22:21:53 2013 +0200
@@ -341,6 +341,8 @@
                         checker.messages.sort(key=lambda a: a[1])
                         for message in checker.messages:
                             fname, lineno, position, text = message
+                            if lineno > len(source):
+                                lineno = len(source)
                             if "__IGNORE_WARNING__" not in Utilities.extractLineFlags(
                                     source[lineno - 1].strip()):
                                 self.noResults = False