Add `NULL` pointer check before `void_expr_error()`; fix
MODIFY
mrbgems/mruby-compiler/core/parse.y
mrbgems/mruby-compiler/core/parse.y
@@ -3664,8 +3664,10 @@ void_expr_error(parser_state *p, node *n)
break;
case NODE_AND:
case NODE_OR:
+ if (n->cdr) {
void_expr_error(p, n->cdr->car);
void_expr_error(p, n->cdr->cdr);
+ }
break;
case NODE_BEGIN:
if (n->cdr) {

Add `NULL` pointer check before `void_expr_error()`; fix #4192