diff --git a/du5/program.c b/du5/program.c
index ba97cfe..d20e864 100644
--- a/du5/program.c
+++ b/du5/program.c
@@ -115,7 +115,21 @@ int main() {
     }
     
     char dummy[LINE_SIZE];
-    fgets(dummy, sizeof(dummy), stdin);
+    if (fgets(dummy, sizeof(dummy), stdin) == NULL) {
+        printf("Expert z bufetu to vie.\n");
+        printf("Chybna databaza\n");
+        cleanup_tree(root);
+        return 0;
+    }
+    
+    dummy[strcspn(dummy, "\n\r")] = '\0';
+    
+    if (strlen(dummy) != 0) {
+        printf("Expert z bufetu to vie.\n");
+        printf("Chybna databaza\n");
+        cleanup_tree(root);
+        return 0;
+    }
     
     int answer_count = how_many_answers(root);