What steps will reproduce the problem? 1. <presence to="group@groups.localhost"><x xmlns="http://jabber.org/protocol/muc"/></presence> What is the expected output? <presence type="error"/> What do you see instead? error Traceback[c2s]: plugins/muc/muc.lib.lua:475: bad argument #1 to 'resourceprep' (string expected, got nil) stack traceback: [C]: in upvalue 'resourceprep' plugins/muc/muc.lib.lua:475: in field '?' ./util/events.lua:81: in function <./util/events.lua:77> (...tail calls...) plugins/muc/muc.lib.lua:503: in function <plugins/muc/muc.lib.lua:490> (...tail calls...) ./util/events.lua:81: in function <./util/events.lua:77> (...tail calls...) ./core/stanza_router.lua:188: in upvalue 'core_post_stanza' ./core/stanza_router.lua:128: in upvalue 'core_process_stanza' plugins/mod_c2s.lua:366: in upvalue 'func' ./util/async.lua:149: in function <./util/async.lua:147> What version of the product are you using? Reproducible on 13.0.1 and most likely affects 0.12.x as well Please provide any additional information below.

Fixed in https://hg.prosody.im/trunk/rev/3609d8fcad00

• tags Milestone-13.0 Status-Fixed
• owner Zash