gazebo crashes at the very end

When the sim exits (in docker), it crashes with this error. The score is reported correctly in the performance.log file.

[ INFO] [1554650493.153383252, 337.255000000]: Completed trajectory execution 

[ERROR] [1554650504.357286360, 340.837000000]: agv2::kit_tray_2::kit_tray_2::tray: 

Handle get content service called by: /gazebo
[ERROR] [1554650504.358558255, 340.837000000]: [INFO] AGV 'agv2' delivery triggered

terminate called after throwing an instance of 'std::system_error'

  what():  Resource deadlock avoided

Aborted (core dumped)

========================================================================
========REQUIRED process [gazebo-3] has died!

process has died [pid 87, exit code 134, cmd /opt/ros/melodic/lib/gazebo_ros/gzserver -u --
verbose -e ode -r --record_period 0.01 --record_path=/home/ariac/.ariac/log/gazebo 

/tmp/ariac/gear.world __name:=gazebo __log:=/home/ariac/.ros/log/7abfa978-5946-11e9-8ba0-0242ac120016/gazebo-3.log].

log file: /home/ariac/.ros/log/7abfa978-5946-11e9-8ba0-0242ac120016/gazebo-3*.log

Initiating shutdown!

================================================================================

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