--TEST-- GH-13827 (Null pointer access of type 'zval' in phpdbg_frame) --FILE-- start(); $fiber = null; gc_collect_cycles(); ?> --PHPDBG-- r t q --EXPECTF-- [Successful compilation of %s] prompt> [Uncaught GracefulExit in on line 0: ] >00006: Fiber::suspend(); 00007: }); 00008: prompt> frame #0: {closure}() at %s:6 => {closure} (internal function) prompt>