when zabbix alert & send mail zabbix crashed

error log:-

1087:20190206:115424.176 Please consider attaching a disassembly listing to your bug report.
1087:20190206:115424.176 This listing can be produced with, e.g., objdump -DSswx zabbix_server.
1087:20190206:115424.176 ================================
1080:20190206:115424.177 One child process died (PID:1087,exitcode/signal:1). Exiting ...
zabbix_server [1080]: Error waiting for process with PID 1087: [10] No child processes
1080:20190206:115424.209 syncing history data...
1080:20190206:115424.209 syncing history data done
1080:20190206:115424.209 syncing trend data...
1080:20190206:115424.211 syncing trend data done
1080:20190206:115424.212 Zabbix Server stopped. Zabbix 4.0.3 (revision 87993).