diff --git a/cv7/program.c b/cv7/program.c
index 17d4762..27ab8aa 100644
--- a/cv7/program.c
+++ b/cv7/program.c
@@ -101,6 +101,12 @@ int main() {
         line_count++;
     }
 
+    if (line_count == 0) {
+        printf("Expert z bufetu to vie.\n");
+        printf("Chybna databaza\n");
+        return 0;
+    }
+
     int index = 0;
     Node *root = parse_knowledge_base(lines, &index, line_count);