diff --git a/geruecht/controller/mainController/mainJobKindController.py b/geruecht/controller/mainController/mainJobKindController.py
index cc23f6c..3eb67f0 100644
--- a/geruecht/controller/mainController/mainJobKindController.py
+++ b/geruecht/controller/mainController/mainJobKindController.py
@@ -63,7 +63,8 @@ class Base:
         for jobkinddate in jobkinddates:
             datum = date(jobkinddate['daydate']['year'], jobkinddate['daydate']['month'], jobkinddate['daydate']['day'])
             if jobkinddate['id'] == -1:
-                self.setJobKindDates(datum, jobkinddate['job_kind'], jobkinddate['maxpersons'])
+                if jobkinddate['job_kind']:
+                    self.setJobKindDates(datum, jobkinddate['job_kind'], jobkinddate['maxpersons'])
             if jobkinddate['id'] == 0:
                 jobkinddate['id'] = jobkinddate['backupid']
                 db.deleteAllWorkerWithJobKind(datetime.combine(datum, time(12)), jobkinddate['job_kind'])