diff --git a/cv5/a_train.c b/cv5/a_train.c
index 76880d1..ef92ddc 100644
--- a/cv5/a_train.c
+++ b/cv5/a_train.c
@@ -45,9 +45,8 @@ void cancel_train(struct car* first) {
     }
     if(first->next == NULL){
        free(first);
-       //first = NULL;
     }
-    else{    
+    else if(first->next != NULL){    
         cancel_train(first->next);
         first->next = NULL;
     }