Crash in MaxScale 2.1.12

2017-12-19 16:28:26 error : (341578) [MySQLClient] Routing the query failed. Session will be closed.
2017-12-19 16:42:00 alert : (341585) Fatal: MaxScale 2.1.12 received fatal signal 11. Attempting backtrace.
2017-12-19 16:42:00 alert : (341585) Commit ID: source-build System name: Linux Release string: undefined
2017-12-19 16:42:00 alert : (341585) /usr/bin/maxscale() [0x405dd7]
2017-12-19 16:42:00 alert : (341585) /lib/x86_64-linux-gnu/libpthread.so.0(+0xf890) [0x7f175cd8d890]
2017-12-19 16:42:00 alert : (341585) /usr/lib/x86_64-linux-gnu/maxscale/libreadwritesplit.so(+0x5f11) [0x7f1757980f11]
2017-12-19 16:42:00 alert : (341585) /usr/lib/x86_64-linux-gnu/maxscale/libreadwritesplit.so(handle_master_is_target+0x73) [0x7f1757982123]
2017-12-19 16:42:00 alert : (341585) /usr/lib/x86_64-linux-gnu/maxscale/libreadwritesplit.so(route_single_stmt+0xbc) [0x7f175798255c]
2017-12-19 16:42:00 alert : (341585) /usr/lib/x86_64-linux-gnu/maxscale/libreadwritesplit.so(+0x37a5) [0x7f175797e7a5]
2017-12-19 16:42:00 alert : (341585) /usr/lib/x86_64-linux-gnu/maxscale/libMySQLClient.so(+0x2a9e) [0x7f1756886a9e]
2017-12-19 16:42:00 alert : (341585) /usr/lib/x86_64-linux-gnu/maxscale/libmaxscale-common.so.1.0.0(+0x46b18) [0x7f175d4b6b18]
2017-12-19 16:42:00 alert : (341585) /usr/lib/x86_64-linux-gnu/maxscale/libmaxscale-common.so.1.0.0(poll_waitevents+0x3be) [0x7f175d4b797e]
2017-12-19 16:42:00 alert : (341585) /usr/bin/maxscale(_Z18worker_thread_mainPv+0x99) [0x406269]
2017-12-19 16:42:00 alert : (341585) /lib/x86_64-linux-gnu/libpthread.so.0(+0x8064) [0x7f175cd86064]
2017-12-19 16:42:00 alert : (341585) /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f175b63f62d]