From a4e02b775fed4f3635acbca8578b464466876dd9 Mon Sep 17 00:00:00 2001
From: vj586da <valer.jakubco@student.tuke.sk>
Date: Thu, 4 Nov 2021 20:14:54 +0100
Subject: [PATCH] clear train

---
 cv4/a_train.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cv4/a_train.c b/cv4/a_train.c
index 290ed95..db20e3a 100755
--- a/cv4/a_train.c
+++ b/cv4/a_train.c
@@ -40,6 +40,9 @@ void cancel_train(struct car* first) {
 
 struct car* clear_train(struct car* first, const char* target) {
 	struct car* this = first;
+	if (this == NULL){
+		return NULL;
+	}
 	while( this->next->next != NULL){
 		if(strcmp(this->value, target) == 0){
 			this->next == this->next->next;