Prosody password change error

gistfile1.txt

Jul 03 15:43:09 mod_c2s	error	Traceback[c2s]: /usr/lib/prosody/modules/mod_register.lua:118: attempt to index a nil value
stack traceback:
	/usr/lib/prosody/modules/mod_register.lua:118: in function </usr/lib/prosody/modules/mod_register.lua:85>
	(tail call): ?
	/usr/lib/prosody/util/events.lua:67: in function </usr/lib/prosody/util/events.lua:63>
	(tail call): ?
	/usr/lib/prosody/modules/mod_iq.lua:70: in function '?'
	/usr/lib/prosody/util/events.lua:67: in function 'fire_event'
	/usr/lib/prosody/core/stanza_router.lua:184: in function 'core_post_stanza'
	/usr/lib/prosody/core/stanza_router.lua:132: in function </usr/lib/prosody/core/stanza_router.lua:55>
	(tail call): ?
	[C]: in function 'xpcall'
	...
	[C]: in function 'parse'
	/usr/lib/prosody/util/xmppstream.lua:255: in function 'feed'
	/usr/lib/prosody/modules/mod_c2s.lua:230: in function 'data'
	/usr/lib/prosody/modules/mod_c2s.lua:252: in function </usr/lib/prosody/modules/mod_c2s.lua:249>
	(tail call): ?
	/usr/lib/prosody/net/server_select.lua:848: in function </usr/lib/prosody/net/server_select.lua:830>
	[C]: in function 'xpcall'
	/usr/bin/prosody:373: in function 'loop'
	/usr/bin/prosody:403: in main chunk
	[C]: ?