xdebug/xdebug — pull request #60 by payden (2013-03-04 01:07:56+00:00)
Title: Check for NULL str in xdebug_str_add

Added test case that causes xdebug_str_add to be called with NULL
str. Added quick check in xdebug_str_add to return if str NULL.

This is in regards to PHP Bug #64168 where serialization of closure causes xdebug to segfault.