Index: univention-directory-manager-modules/modules/univention/admin/handlers/shares/share.py
===================================================================
--- univention-directory-manager-modules/modules/univention/admin/handlers/shares/share.py	(Revision 35056)
+++ univention-directory-manager-modules/modules/univention/admin/handlers/shares/share.py	(Arbeitskopie)
@@ -720,6 +720,8 @@
 def insertQuotes(value):
 	'Turns @group name, user name into @"group name", "user name"'
 
+	if not value:
+		return value
 	entries=value.split(",")
 	new_entries=""
 	for entry in entries: