1 files changed, 6 insertions, 1 deletions
diff --git a/js/index.js b/js/index.js
index b9e1c61..fafdf66 100644
--- a/js/index.js
+++ b/js/index.js
@@ -351,8 +351,13 @@ function parseVertretungen(str, username){
     var vertretungenRe = /([\wäöü]+)[ ]+(\d+(?:[ ]*-[ ]*\d+)?)[ ]+(x?)[ ]*(?:(?:([\wäöü]+|\+)[ ]*->[ ]*([\wäöü]+|\+))|(?:()([\wäöü]+|\+)))[ ]+(?:(?:(\d+|---)[ ]*->[ ]*(\d+|---))|(?:()(\d+|---)))[ ]+([\wäöü]+|---|[+.])[ ]+(?:(?:([\wäöü]+|\+)[ ]*->[ ]*([\wäöü]+|\+))|(?:()([\wäöü]+|\+)))[ ]*([\wäöü]*)/i;
     var res;
     var vertretungen = [];
+    var nutzerklasse;
 
-    var nutzerklasse = username.match(/(\w+)_.*/)[1].toUpperCase();
+    if(username.search(/\w+_.*/)){
+        nutzerklasse = username.match(/(\w+)_.*/)[1].toUpperCase();
+    }else{
+        return [];
+    }
 
     str.split('\n').forEach(function(vertretungsstr){
         result = vertretungsstr.match(vertretungenRe);