diff --git a/build/test/out/c/quizduell.o b/build/test/out/c/quizduell.o
index a06cec8..ee0facf 100644
Binary files a/build/test/out/c/quizduell.o and b/build/test/out/c/quizduell.o differ
diff --git a/build/test/out/test_quizduell.out b/build/test/out/test_quizduell.out
index a2ccd82..c3bf663 100755
Binary files a/build/test/out/test_quizduell.out and b/build/test/out/test_quizduell.out differ
diff --git a/build/test/results/test_casualQuiz.pass b/build/test/results/test_casualQuiz.pass
index e93f606..036999b 100644
--- a/build/test/results/test_casualQuiz.pass
+++ b/build/test/results/test_casualQuiz.pass
@@ -11,4 +11,4 @@
   :failed: 0
   :ignored: 0
 :stdout: []
-:time: 0.016199899999946865
+:time: 0.01581269999996948
diff --git a/build/test/results/test_quizduell.pass b/build/test/results/test_quizduell.pass
index 7685b4d..717d64b 100644
--- a/build/test/results/test_quizduell.pass
+++ b/build/test/results/test_quizduell.pass
@@ -15,4 +15,4 @@
   :failed: 0
   :ignored: 0
 :stdout: []
-:time: 0.0318529999999555
+:time: 0.03229369999985465
diff --git a/build/test/results/test_timequiz.pass b/build/test/results/test_timequiz.pass
index 31f9cc9..eb50023 100644
--- a/build/test/results/test_timequiz.pass
+++ b/build/test/results/test_timequiz.pass
@@ -11,4 +11,4 @@
   :failed: 0
   :ignored: 0
 :stdout: []
-:time: 0.01590089999990596
+:time: 0.016001700000060737
diff --git a/build/test/results/test_wwm.pass b/build/test/results/test_wwm.pass
index d49875e..47a55ed 100644
--- a/build/test/results/test_wwm.pass
+++ b/build/test/results/test_wwm.pass
@@ -11,4 +11,4 @@
   :failed: 0
   :ignored: 0
 :stdout: []
-:time: 0.016400100000055318
+:time: 0.016434800000070027
diff --git a/src/quizduell.c b/src/quizduell.c
index 26455d9..db3f992 100644
--- a/src/quizduell.c
+++ b/src/quizduell.c
@@ -100,6 +100,12 @@ void quizduell() {
             befreieKategorie(&kategorien[auswahlIndex]);
         }
 
+        else {
+
+            printf("Invalid selection.\n");
+
+        }
+
         return;
 
     }