EffortJointInterface causes gazebo to segfault

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I'm trying to use <hardwareInterface>hardware_interface/EffortJointInterface</hardwareInterface> in my URDF but Gazebo crashes after starting the controllers. I thought i was doing something wrong, so i tried the RRBot demo and had the same issue: https://github.com/ros-simulation/gaz...

• OS: Ubuntu 16.04
• ROS Distro: Kinetic
• ROS Version: 1.12.14
• Gazebo Version: 7.14 (tried on 7.0 as well, same issue)

Error (with debug and verbose turned on):

Thread 37 "gzserver" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fff4effd700 (LWP 12785)]
0x00007fff11c7773d in gazebo_ros_control::DefaultRobotHWSim::readSim(ros::Time, ros::Duration) () from /home/bob/workspace/devel/lib//libdefault_robot_hw_sim.so
(gdb)

Is this a bug? I've noticed other people submitting issues on the repo with the same problem.

Thanks.