Fix crash on join player

Set the joinplayer_timeout default value to 15 minutes

default_settings.conf

@@ -21,7 +21,7 @@ enable_local_ban = true
 ban_entries_visible = false
 
 # Maximum time between the on_prejoinplayer and the on_joinplayer callbacks, in seconds
-joinplayer_timeout = 7
+joinplayer_timeout = 900
 
 # Whether to enable by-client translation using intllib.
 enable_intllib = true

session.lua

@@ -129,6 +129,7 @@ umabis.register_on_reload(function()
 			minetest.kick_player(name, "Sorry, it seems that your Umabis session was not prepared."..
 				"This is a bug. Use the latest version of Minetest and contact the server administrator"..
 				" (their nick is "..minetest.settings:get("name")..").")
+			return
 		end
 
 		session.timeout = nil