NullPointerException in PushPublishRTMP

Hi,

I am using wowza in a live streaming use case in which incoming RTP over RTSP data is transcoded to RTMP. The RTMP stream is being pushed to an akamai entry point server. I am able to do this succefully. However i see exceptions being generated from within Wowza PushPublishRTMP module. The following is the log generated:

2015-06-16 03:11:26 PDT comment server ERROR 500 - service : java.lang.NullPointerException|at com.wowza.wms.pushpublish.protocol.rtmp.PushPublishRTMP$PublishHandler.sendPackets(PushPublishRTMP.java:808)|at com.wowza.wms.pushpublish.protocol.rtmp.PushPublishRTMP$PublishHandler.play(PushPublishRTMP.java:1157)|at com.wowza.wms.netconnection.NetConnectionAdapter.service(NetConnectionAdapter.java:173)|at com.wowza.wms.netconnection.NetConnectionSessionHandler.a(NetConnectionSessionHandler.java:202)|at com.wowza.wms.netconnection.NetConnectionSessionHandler.b(NetConnectionSessionHandler.java:96)| - - - 29009.599 - - - - - - - - - - - - - - - - - - - - - - - - -

2015-06-16 03:11:26 PDT comment server ERROR 500 - service : java.lang.NullPointerException|at com.wowza.wms.pushpublish.protocol.rtmp.PushPublishRTMP$PublishHandler.sendPackets(PushPublishRTMP.java:808)|at com.wowza.wms.pushpublish.protocol.rtmp.PushPublishRTMP$PublishHandler.play(PushPublishRTMP.java:1157)|at com.wowza.wms.netconnection.NetConnectionAdapter.service(NetConnectionAdapter.java:173)|at com.wowza.wms.netconnection.NetConnectionSessionHandler.a(NetConnectionSessionHandler.java:202)|at com.wowza.wms.netconnection.NetConnectionSessionHandler.b(NetConnectionSessionHandler.java:96)| - - - 29009.85 - - - - - - - - - - - - - - - - - - - - - - - - -

I am able to receive and play the stream on the akamai server without any issue. I see these logs on few occasions and i am not able to reproduce it consistently. Can this cause any problem? Is there any issue with the way we are making API calls to PushPublishRTMP? Some more information below:

Software version: WowzaStreamingEngine - v4.1.2

OS: Ubuntu 12.04 (64 bit)

The wowza streaming engine software is running on amazon ec2 instance

Rakshith