The line 218 in file src/modules/ims_ipsec_pcscf/cmd.c is now a comment in branch 5.3. Probably some new commits were pushed. Not working with ims modules to say more about those changes, but maybe you can try with latest branch 5.3 and see if it got fixed? If not, attach the backtraces of the new core files in order to match with the latest version of source code.