diff --git a/src/steps/advoware_cal_sync/calendar_sync_event_step.py b/src/steps/advoware_cal_sync/calendar_sync_event_step.py
index 56534d5..8964302 100644
--- a/src/steps/advoware_cal_sync/calendar_sync_event_step.py
+++ b/src/steps/advoware_cal_sync/calendar_sync_event_step.py
@@ -340,13 +340,13 @@ def adjust_times(start_dt, end_dt, data):
     try:
         vorb_h, vorb_m, vorb_s = map(int, vorbereitungs_dauer.split(':'))
         vorbereitung_td = timedelta(hours=vorb_h, minutes=vorb_m, seconds=vorb_s)
-    except:
+    except (ValueError, AttributeError):
         vorbereitung_td = timedelta(0)
     
     try:
         fahrt_h, fahrt_m, fahrt_s = map(int, fahrzeit.split(':'))
         fahrt_td = timedelta(hours=fahrt_h, minutes=fahrt_m, seconds=fahrt_s)
-    except:
+    except (ValueError, AttributeError):
         fahrt_td = timedelta(0)
     
     hinfahrt_td = timedelta(0)