diff --git a/du5/snake.c b/du5/snake.c
index 876b570..95047b2 100644
--- a/du5/snake.c
+++ b/du5/snake.c
@@ -10,7 +10,8 @@ struct snake* add_snake(struct snake* snake,int x,int y){
 }
 
 struct snake* remove_snake(struct snake* snake){
-    	struct snake* part = snake;
+	struct snake* part = snake;
+	if (snake == NULL) return NULL;
 	if (part->next == NULL) {
 		free(part);
 		return NULL;