[SR-Users] Textops and Multipart Body - adding ISUP segfaults Kamailio

Hi, I am using Kamailio version: kamailio 4.3.0 (x86_64/linux) c6aa95 on CentOS 6 I am trying to encapsulate ISUP in the INVITE: ...if(has_body("application/sdp")){      set_body_multipart();         if(msg_apply_changes())         {              $var(acm) = "7e Od 04 55 75 69 20 4d 61 6b 65 43 61 6c 6c";                 append_body_part("$var(acm)","application/isup; version=itu-t92+","signal; handling=optional");        xlog("L_INFO", "ISUP Changes Applied Succesfully");        }} ...And getting the following error: Jul  7 14:59:12 ukrcld1000 kamailio: DEBUG: <core> [msg_translator.c:1691]: get_boundary(): boundary is <--unique-boundary-1>...Jul  7 14:59:12 ukrcld1000 kamailio: DEBUG: <core> [msg_translator.c:1808]: check_boundaries(): last bondary without -- at the end Jul  7 14:59:12 ukrcld1000 kamailio: DEBUG: <core> [msg_translator.c:1612]: replace_body(): old size body[365] actual[534]Jul  7 14:59:12 ukrcld1000 kamailio: CRITICAL: <core> [data_lump.c:463]: free_lump(): non free-able lump: 0x7f7a33d5ae40 flags=1 and then Kamailio crashes. Can you please recommend? Thanks,Andrei