"c0000005" error occurs and Skype for Business or Lync 2013 crashes when you upload a file to a persistent chat room

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Lync Server 2013 Skype for Business More...Less

Symptoms

Consider the following scenario:

You clear the Enable file upload option in Persistent Chat category.
You set EnableP2PFileTransfer to True in Conferencing Policy Settings.
You upload a file to a persistent chat room in Microsoft Lync 2013 (Microsoft Skype for Business).

In this scenario, you receive the following error message:

Problem Event Name: APPCRASHApplication Name: lync.exeApplication Version: XX.X.XXXX.XXXXApplication Timestamp: 53c5caa5Fault Module Name: Uc.dllFault Module Version: XX.X.XXXX.XXXXFault Module Timestamp: 53c5df18Exception Code: c0000005Exception Offset: 0000000000231bddOS Version: X.X.XXXX.X.X.X.XXX.XLocale ID: 2057

Resolution

To fix this issue, install the September 8, security 2015 update (KB3085500) for Lync 2013 (Skype for Business).Note Lync 2013 was upgraded to Skype for Business in April 2015.