Steps to reproduce:

1. Download and open project "Particle_Sub_Emitters"
2. Open scene "SimpleDebug"
2. Play the scene

Actual result: Crash when trying to play the scene.

Expected result: Playing particles the same way as in editor mode.

Notice when Sub_emitters are disabled and pushing the "play" button, the scene don't crash. After playing the scene while Sub_emitters are disabled you can enable them later while playing the scene. You can look at it in the attached video "2016-01-29_1608.swf".

Workaround: Disable Sub_emitters before playing the scene and enable them later while still being in "Play-mode".

Bug introduced in: 5.4