diff --git a/management/mail_log.py b/management/mail_log.py
index b654dcbc..0e1b6c5f 100755
--- a/management/mail_log.py
+++ b/management/mail_log.py
@@ -636,6 +636,7 @@ def print_time_table(labels, data, do_print=True):
 
     if do_print:
         print("\n".join(lines))
+        return None
     else:
         return lines
 
diff --git a/management/mailconfig.py b/management/mailconfig.py
index b6c45c24..e5697929 100755
--- a/management/mailconfig.py
+++ b/management/mailconfig.py
@@ -491,6 +491,7 @@ def add_mail_alias(address, forwards_to, permitted_senders, env, update_if_exist
 	if do_kick:
 		# Update things in case any new domains are added.
 		return kick(env, return_status)
+	return None
 
 def remove_mail_alias(address, env, do_kick=True):
 	# convert Unicode domain to IDNA
@@ -506,6 +507,7 @@ def remove_mail_alias(address, env, do_kick=True):
 	if do_kick:
 		# Update things in case any domains are removed.
 		return kick(env, "alias removed")
+	return None
 
 def add_auto_aliases(aliases, env):
 	conn, c = open_database(env, with_connection=True)