Segmentation fault (signal 11) after max_user_connections-related authentication failure

2018-02-01 08:27:13   error  : Invalid authentication message from backend. Error : 42000, Msg : User 'appuser' has exceeded the 'max_user_connections' resource (current value: 200)

2018-02-01 08:27:13   error  : Backend server didn't accept authentication for user appuser.

2018-02-01 08:27:13   error  : Loading database names for service Write Service encountered error when querying database privileges: Lost connection to MySQL server during query.

2018-02-01 08:27:13   error  : Write Service: Refresh rate limit exceeded for load of users' table.

2018-02-01 08:27:13   notice : Write Service: login attempt for user 'appuser'@10.1.1.2:16826, authentication failed.

2018-02-01 08:27:13   error  : Fatal: MaxScale 2.0.5 received fatal signal 11. Attempting backtrace.

2018-02-01 08:27:13   error  : Commit ID: 60c69d0f7f461a1773a4e848e87fa3fcc7b0e421 System name: Linux Release string: Red Hat Enterprise Linux Server release 6.9 (Santiago)

2018-02-01 08:27:13   error  : Invalid authentication message from backend. Error : 42000, Msg : User 'appuser' has exceeded the 'max_user_connections' resource (current value: 200)

2018-02-01 08:27:13   error  :   /usr/bin/maxscale() [0x403b9c] 

2018-02-01 08:27:13   error  :   /lib64/libpthread.so.0() [0x3c2fc0f7e0] 

2018-02-01 08:27:13   notice : Write Service: login attempt for user 'appuser'@10.1.1.3:51096, authentication failed.

2018-02-01 08:27:13   error  : Backend server didn't accept authentication for user appuser.

2018-02-01 08:27:13   error  : Write Service: Refresh rate limit exceeded for load of users' table.