Index: base/univention-config-registry/python/univention/config_registry/frontend.py
===================================================================
--- base/univention-config-registry/python/univention/config_registry/frontend.py	(Revision 73141)
+++ base/univention-config-registry/python/univention/config_registry/frontend.py	(Arbeitskopie)
@@ -122,10 +122,16 @@
 	Set config registry variables in args.
 	Args is an array of strings 'key=value' or 'key?value'.
 	"""
+	if isinstance(args, str):
+		args = [args]
+	if not isinstance(args, list):
+		raise TypeError
 	ucr = _ucr_from_opts(opts)
 	with ucr:
 		changes = {}
 		for arg in args:
+			if not isinstance(arg, str):
+				raise TypeError
 			sep_set = arg.find('=')  # set
 			sep_def = arg.find('?')  # set if not already set
 			if sep_set == -1 and sep_def == -1: