diff --git a/cv9/snake.c b/cv9/snake.c
index 7cad4c4..a3eaa81 100644
--- a/cv9/snake.c
+++ b/cv9/snake.c
@@ -2,10 +2,10 @@
 #include <stdlib.h>
 
 struct snake* add_snake(struct snake* snake,int x,int y){
-    struct snake* head = calloc(1,sizeof(struct snake));
-    if (head == NULL) {
+    if (snake == NULL) {
     return NULL;
     }
+    struct snake* head = calloc(1,sizeof(struct snake));
     head->x = x;
     head->y = y;
     head->next = snake;