Gazebo crashes on model deletion

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I am attempting to delete (and subsequently re-spawn, with a different 3D mesh) a static model in Gazebo. When I do, Gazebo is crashing consistently.

Here is an excerpt from the gazebo log:

gzserver: /usr/include/boost/smart_ptr/shared_ptr.hpp:653: typename boost::detail::sp_member_access<T>::type boost::shared_ptr<T>::operator->() const [with T = gazebo::physics::Inertial; typename boost::detail::sp_member_access<T>::type = gazebo::physics::Inertial*]: Assertion `px != 0' failed.

(truncated some plugin output here, which looks sane)

Aborted (core dumped)
================================================================================REQUIRED process [gazebo-2] has died!
process has died [pid 23768, exit code 134, cmd /opt/simulation/lib/gazebo_ros/gzserver -u -r -e ode /var/tmp/ros/temp.world __name:=gazebo __log:=/home/administrator/.ros/log/eb76bd24-e192-11e6-a6dd-005056b4a883/gazebo-2.log].
log file: /home/administrator/.ros/log/eb76bd24-e192-11e6-a6dd-005056b4a883/gazebo-2*.log
Initiating shutdown!
================================================================================

I'm calling the delete service from Python, as follows:

self._delete_env_cli = rospy.ServiceProxy('/gazebo/delete_model', DeleteModel)
try:
        rospy.wait_for_service('/gazebo/delete_model')
        resp = self._delete_env_cli(model_name='barrier')
except rospy.ServiceException as e:
        rospy.logerr("Service did not process request: {}".format(e))

I see this behaviour with or without rospy.wait_for_service().

Gazebo 7.5.0, ROS Indigo. I'm also running GzWeb (head of gzweb_1.3.0) which is connected to this instance - not sure if that would impact anything.