[SR-Users] Check if xavp is set

Hi all, What's the most efficient way to check if an xavp is set? I have tried- is_avp_set() from avpops module which resulted in- ERROR: avpops [avpops.c:915]: fixup_is_avp_set(): bad attribute name <$xavp(tm_contacts)> and if ($xavp(tm_contacts)) {} which resulted in - WARNING: <core> [rvalue.c:1007]: rval_get_int(): automatic string to int conversion for "<<xavp:0x7feac74cfcb8>>" failed To give a little background, I am using the UAC_redirect module and t_next_contacts() in conjunction with 302 redirects .However if there is only a single contact, $xavp(tm_contacts) is not created and t_next_contacts() fails, hence why I'd like to check if it exists first. Thanks