Get Blackboard returns None when called from Event Tick

Development Programming & Scripting
1

In an AIController blueprint, calling either type of Get Blackboard node returns None, but only when called from Event Tick. Calling the exact same nodes from a function looped every 0.015 seconds returns no errors.

Here is the offending bit of blueprint nodes:

73544-isvalidaccessednonebp.png
73544-isvalidaccessednonebp.png769×289 41 KB

And the output log:

73545-isvalidaccessednoneoutputlog.png
73545-isvalidaccessednoneoutputlog.png573×690 134 KB

I tested this by connecting the get Blackboard node to the IsValid node directly, which always fires IsNotValid when the function is called by Event Tick.When this function is called via a looping timer, no error appears and the blackboard values can be both gotten and set successfully.

So thankfully, there is a workaround, but any ideas what could be causing this?

2

I am having the same problem. my Get Blackboard is returning null in my AiController class

PIE:Error: Error Blueprint Runtime Error: Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue from function: 'SetNewTargetObject' from node: Set Value as Object in graph: SetNewTargetObject in object: AI_ControllerBase with description: Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue
PIE:Error: Error Blueprint Runtime Error: Accessed None trying to read property Blackboard from function: 'SetAIState' from node: Set Value as Enum in graph: SetAIState in object: AI_ControllerBase with description: Accessed None trying to read property Blackboard
PIE:Error: Error Blueprint Runtime Error: Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue from function: 'SetNewTargetObject' from node: Set Value as Object in graph: SetNewTargetObject in object: AI_ControllerBase with description: Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue
PIE:Error: Error Blueprint Runtime Error: Accessed None trying to read property Blackboard from function: 'SetAIState' from node: Set Value as Enum in graph: SetAIState in object: AI_ControllerBase with description: Accessed None trying to read property Blackboard
PIE:Error: Error Blueprint Runtime Error: Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue from function: 'SetNewTargetObject' from node: Set Value as Object in graph: SetNewTargetObject in object: AI_ControllerBase with description: Accessed None trying to read property CallFunc_GetBlackboard_ReturnValue
PIE:Error: Error Blueprint Runtime Error: Accessed None trying to read property Blackboard from function: 'SetAIState' from node: Set Value as Enum in graph: SetAIState in object: AI_ControllerBase with description: Accessed None trying to read property Blackboard