diff --git a/cv7/program.c b/cv7/program.c
index d985f0b..d101106 100644
--- a/cv7/program.c
+++ b/cv7/program.c
@@ -57,13 +57,16 @@ void run_expert_system(Node *node) {
         printf("%s\n", node->text);
         printf("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost: ");
         char answer;
-        scanf(" %c", &answer);
+        if (scanf(" %c", &answer) != 1) {
+            printf("Koniec\n");
+            return;
+        }
         if (answer == 'a') {
             node = node->yes;
         } else if (answer == 'n') {
             node = node->no;
         } else {
-            printf("Neplatná odpoveď. Koniec.\n");
+            printf("Koniec\n");
             return;
         }
     }