Segmentation fault (access null pointer) in Zend/zend_API.h:84 #16359

<?php
$log_file = tempnam(sys_get_temp_dir(), 'php-curl-CURLOPT_WRITEFUNCTION-trampoline');
$fp = fopen($log_file, 'w+');
fwrite($fp, "test");
$ch = curl_init();
curl_setopt($ch, CURLOPT_WRITEFUNCTION, $fusion);
curl_setopt($ch, CURLOPT_URL, 'file://' . $log_file);
curl_exec($ch);