Seems calling function KSR.sqlops.sql_num_rows(«sql_res») crashes Kamailio. At least I got this at 5.1.2 from debian repos with LUA.

Getting smth like

dev1 kernel: [5780693.247255] kamailio[20659]: segfault at 50b300000004 ip 00007f34d2f46fd6 sp 00007ffe1f0ac310 error 4 in sqlops.so[7f34d2f42000+1c000]