diff --git a/du7/snake.c b/du7/snake.c
index ee76ecf..62569e7 100644
--- a/du7/snake.c
+++ b/du7/snake.c
@@ -49,6 +49,8 @@ void free_snake(struct snake* sn){	//funkcia odstráni hada z hry
 }
 
 int is_snake(struct snake* snake,int x,int y){
+	if (snake == NULL) return 0;
+	
     do {
     	if (snake->x == x || snake->y == y) return 1;
 	} while (snake->next != NULL);