Parser: Don't try to print frame 0 (whoops).
@@ -4528,7 +4528,7 @@ static void build_error(lily_parse_state *parser)
if (parser->vm->include_last_frame_in_trace == 0)
frame = frame->prev;
- while (frame->function) {
+ while (frame->prev) {
lily_function_val *func = frame->function;
const char *class_name = func->class_name;
const char *func_name = func->trace_name;
