diff --git a/src/BreCalClient/MainWindow.xaml.cs b/src/BreCalClient/MainWindow.xaml.cs
index 3402794..9389a70 100644
--- a/src/BreCalClient/MainWindow.xaml.cs
+++ b/src/BreCalClient/MainWindow.xaml.cs
@@ -189,8 +189,15 @@ namespace BreCalClient
                     esc.ShipcallModel.Shipcall?.Participants.Clear();
                     foreach (ParticipantAssignment pa in esc.ShipcallModel.AssignedParticipants.Values)
                         esc.ShipcallModel.Shipcall?.Participants.Add(pa);
-                    this._api.ShipcallsPost(esc.ShipcallModel.Shipcall); // save new ship call
-                    this.AddShipcall(esc.ShipcallModel);
+                    try
+                    {
+                        this._api.ShipcallsPost(esc.ShipcallModel.Shipcall); // save new ship call
+                        this.AddShipcall(esc.ShipcallModel);
+                    }
+                    catch(Exception ex)
+                    {
+                        this.ShowErrorDialog(ex.ToString(), ex.Message);
+                    }
 
                     _refreshImmediately = true; // set flag to avoid timer loop termination
                     _tokenSource.Cancel(); // force timer loop end