diff --git a/UID/Dienstplan/frmDienstplanVariabel.vb b/UID/Dienstplan/frmDienstplanVariabel.vb
index d134d5d..f15858e 100644
--- a/UID/Dienstplan/frmDienstplanVariabel.vb
+++ b/UID/Dienstplan/frmDienstplanVariabel.vb
@@ -1083,12 +1083,14 @@ Public Class frmDienstplanVariabel
                     End If
                     ' ctxtDgvSchicht1.Items(0).Text = String.Format("This is the cell at {0}, {1}", ht.ColumnIndex, ht.RowIndex)
 
+                    If o IsNot Nothing Then
+                        If o.SCHICHT.dedet_Splitschicht = True Then
+                            thisDgv.ContextMenuStrip = ContextMenuStrip1
+                            If thisDgv.SelectedCells.Count = 0 Then
+                                thisDgv.CurrentCell = thisDgv(ht.ColumnIndex, ht.RowIndex)
+                                thisDgv.CurrentCell.Selected = True
 
-                    If o.SCHICHT.dedet_Splitschicht = True Then
-                        thisDgv.ContextMenuStrip = ContextMenuStrip1
-                        If thisDgv.SelectedCells.Count = 0 Then
-                            thisDgv.CurrentCell = thisDgv(ht.ColumnIndex, ht.RowIndex)
-                            thisDgv.CurrentCell.Selected = True
+                            End If
 
                         End If
 
@@ -1096,7 +1098,7 @@ Public Class frmDienstplanVariabel
 
 
                 End If
-            Else
+                Else
                 RemoveHandler DirectCast(sender, DataGridView).KeyDown, AddressOf changeByKey
                 AddHandler thisDgv.KeyDown, AddressOf changeByKey
 
@@ -2094,6 +2096,11 @@ Public Class frmDienstplanVariabel
         Dim o As usrCntlDienstWoche = Nothing
         If dgv_tmp.Parent.Parent.GetType() Is GetType(usrCntlDienstWoche) Then o = dgv_tmp.Parent.Parent
 
+        If o Is Nothing Then
+            MsgBox("Keine Splitschichten erlaubt!")
+            Exit Sub
+        End If
+
         If o.SCHICHT.dedet_Hauptsplitschicht = False Then
 
             MsgBox("In Schicht " & o.schicht_name & " sind keine Splitschichten erlaubt!")