[Freeswitch-users] How can I detect an execute failure using ESL?

When I try and perform an operation on a channel which has gone, an error is returned. How can I detect this using the ESL? execute() and sendRecv() always return 0 (zero) regardless of whether the command returns +OK or -ERR. sendmsg 5d09753c-ede7-11de-85c6-27ab474dd533 call-command: execute execute-app-name: hangup execute-app-arg: UNALLOCATED_NUMBER Content-Type: command/reply Reply-Text: -ERR invalid session id [5d09753c-ede7-11de-85c6-27ab474dd533] Thanks, Ron