Seg Fault on zend_parse_parameters

Hello, I am having a really hard time figuring out why this is throwing a segment fault. char *input_file = NULL; char *output_file = NULL; zend_bool formatoutput = 0; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ss|b", &input_file, &output_file, &formatoutput) == FAILURE) { zend_throw_exception(NULL, "Function expects 2 or 3 argument", 0 TSRMLS_CC); } when I watch php through gdb is see this in the stack trace: #0 0x082446c1 in ?? () #1 0x082456a0 in zend_parse_parameters () #2 0xb73f4b6e in zif_phpless_parse (ht=2, return_value=0x858198c, return_value_ptr=0x0, this_ptr=0x0, return_value_used=1) at /root/php_less/phpless.cpp:134 #3 0x0828c36d in ?? () #4 0x08264bca in execute () #5 0x0823a2bd in zend_execute_scripts () #6 0x081e2168 in php_execute_script () #7 0x082c8b5d in ?? () #8 0x419d6ebc in __libc_star if I remove the parse params and just hard code the vars it does work just fine. Anyone got any ideas?