diff --git a/matrix.c b/matrix.c
index 3c18152..685c857 100644
--- a/matrix.c
+++ b/matrix.c
@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
 #include "matrix.h"
 
 // TODO Matrix-Funktionen implementieren
@@ -192,4 +193,9 @@ Matrix multiply(const Matrix matrix1, const Matrix matrix2)
 
         return matrix_erg;
     }  
+    else 
+    {
+        printf("Matrix multiplication not possible\n");
+        exit(EXIT_FAILURE);
+    }
 }
\ No newline at end of file