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-rw-r--r--plugins/mod_register.lua2
1 files changed, 1 insertions, 1 deletions
diff --git a/plugins/mod_register.lua b/plugins/mod_register.lua
index bda40124..be1be0ae 100644
--- a/plugins/mod_register.lua
+++ b/plugins/mod_register.lua
@@ -141,7 +141,7 @@ module:add_iq_handler("c2s_unauthed", "jabber:iq:register", function (session, s
username = nodeprep(table.concat(username));
password = table.concat(password);
local host = module.host;
- if not username then
+ if not username or username == "" then
session.send(st.error_reply(stanza, "modify", "not-acceptable", "The requested username is invalid."));
elseif usermanager_user_exists(username, host) then
session.send(st.error_reply(stanza, "cancel", "conflict", "The requested username already exists."));