diff --git a/cv7/program.c b/cv7/program.c
index 60c0280..da58af4 100644
--- a/cv7/program.c
+++ b/cv7/program.c
@@ -15,7 +15,8 @@ struct tree* read_tree(int* counter) {
     memset(buffer, 0, SIZE);
     char* r = fgets(buffer, SIZE, stdin);
     if (buffer[0] == '\n') {
-        return NULL;
+        printf("Chybna databaza\n");
+        return 0;
     }
     struct tree* tree = calloc(1, sizeof(struct tree));
     tree->value = malloc(strlen(buffer) + 1);