Description:
------------
This bug is related to bug #50005, so the snippet from Zend/tests/bug50005.phpt 
. The BT below

>	msvcr110d.dll!_strdup_dbg(const char * string, int nBlockUse, const char 
* szFileName, int nLine) Line 73	C
 	php5_debug.dll!php_error_cb(int type, const char * error_filename, const 
unsigned int error_lineno, const char * format, char * args) Line 983	C
 	php5_debug.dll!zend_error_va(int type, const char * file, unsigned int 
lineno, const char * format, ...) Line 792	C
 	php5_debug.dll!zend_exception_error(_zval_struct * exception, int 
severity) Line 832	C
 	php5_debug.dll!zend_execute_scripts(int type, _zval_struct * * retval, 
int file_count, ...) Line 1343	C
 	php5_debug.dll!php_execute_script(_zend_file_handle * primary_file) Line 
2479	C
 	php.exe!do_cli(int argc, char * * argv) Line 994	C


Test script:
---------------
<?php

class a extends exception {
        public function __construct() {
                $this->file = null;
        }
}

throw new a;

Expected result:
----------------
no crash

Actual result:
--------------
crash