diff --git a/cv8/program.c b/cv8/program.c
index 758caa4..f76a546 100644
--- a/cv8/program.c
+++ b/cv8/program.c
@@ -18,7 +18,11 @@ struct node* read_tree(int* count, int* leafs){
     char buffer[SIZE];
     memset(buffer,0,SIZE);
     char* r = fgets(buffer,SIZE,stdin);
-    assert(r);
+    if(r == NULL){
+		puts("Expert z bufetu to vie.");
+		puts("Chybna databaza");
+		exit(0);
+	}
     struct node* node = calloc(1,sizeof(struct node));
     memcpy(node->data,buffer,SIZE);
     if(r[0]!='*'){