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ROS/Gazebo Camera Plugin Crashing

Hi all - I am having some problems with the ROS/Gazebo Camera Plugin. I started out with following the link here: and putting the sensor/plugin together in my sdf file and everything was working fine, including publishing the image topic via ROS. Now it seems that the plugin doesn't work, and as far as I can tell nothing changed on my system.

Here is a link to the sdf file in question:

When I click the "Start" buttin in Gazebo I get the following error: Segmentation fault (core dumped) [gazebo-1] process has died [pid 31712, exit code 139, cmd /opt/ros/kinetic/lib/gazebo_ros/gzserver -u -e ode /home/robot/catkin_ws/src/icarus_sim/worlds/ __name:=gazebo __log:=/home/robot/.ros/log/483a4954-3479-11ea-ace1-b827ebcf9c85/gazebo-1.log]. log file: /home/robot/.ros/log/483a4954-3479-11ea-ace1-b827ebcf9c85/gazebo-1*.log

If I comment out the plugin section in the sdf file my Gazebo model will run fine, just won't publish the image via ROS. I am using Gazebo v9, and for troubleshooting I verified the GAZEBO_PLUGIN_PATH contains this plugin and also did a sudo apt-get update and upgrade.

Anybody have any ideas?