Definition of multiple light sources in a world file

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Hi guys,

i need to include multiple light sources in my world file. By adding the default sun model in .gazebo/models as well as a manual defined directional light gazebo (v 2.2.3) crashes (for code see below).

<!-- global light source -->
<include>
  <uri>model://sun</uri>
</include>
<!-- Additional light -->
<light type="directional" name="my_light">
    <origin pose="0 0 30 0 0 0"/>
    <diffuse rgba=".9 .9 .9 1"/>
    <specular rgba=".1 .1 .1 1"/>
    <attenuation range="20"/>
    <direction xyz="0 0 -1"/>
</light>

This snippet causes the following error:

gzserver: /usr/include/boost/thread/pthread/recursive_mutex.hpp:101: boost::recursive_mutex::~recursive_mutex(): Assertion `!pthread_mutex_destroy(&m)' failed.

Are there any example worlds with (different) multiple light sources available?

Best regards!