Multiplayer First Person Shooter Kit

Thank you for the latest 4.15 update, much appreciated. Currently after taking damage from another player in multiplayer I am recieving the following error:

Blueprint Runtime Error:

Accessed None trying to read property CallFunv_create_ReturnValue from function: ‘SpawnHurtMarker’ from node SetRenderAngle in graph: SpawnHurtMarker in object: WBP_GameOverlay with description: Accessed None trying to read property CallFunc_Create_ReturnValue

After comparing the 4.13 project with the 4.15 project, I am unable to determine what has changed, that would cause this error. All of the nodes are connected and the references are there.