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Help improving a Player within Actor bounds test

Hello UE4 community,

can anyone advise me on how I can improve my Player is within Actor Bounds test? I'm getting occasional Blueprint runtime errors when the Get Player Pawn evaluates to: None. This test is used to control doors on a dynamically resizing actor to prevent them locking while the player is on the wrong side.

 Blueprint Runtime Error: Accessed None trying to read property CallFunc_GetPlayerPawn_ReturnValue from function: 'ExecuteUbergraph_A100001' from node: Set Player_Inside_Maze in graph: EventGraph in object: A100001 with description: Accessed None trying to read property CallFunc_GetPlayerPawn_ReturnValue

It still works as intended, but I don't like having errors if I can avoid it. The none property appears to happen before gameplay actually starts. So I am guessing that it is happening in a brief moment before the player pawn exists. The boolean output is tested on an overlap event that (at the time) had not been triggered.

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Any thoughts on how I might do this better or prevent that error being generated? Thanks in advance! :-)

Product Version: UE 4.18
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asked Aug 22 '18 at 12:09 PM in Blueprint Scripting

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Before checking your condition, you can check whether the Pawn is valid, like so: IsPawnValid

pawnisvalid.png (62.5 kB)
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answered Aug 22 '18 at 12:20 PM

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avatar image xSheim Aug 22 '18 at 12:27 PM

But according to your condition, wouldn't it be easier to use a volume for this check https://docs.unrealengine.com/en-us/Engine/Actors/Volumes?

avatar image LoneScrapBot Aug 22 '18 at 12:43 PM

Hi xSheim. Quite possibly.

I did it this way because the actor (a maze) I need to test is dynamically generated and resizes constantly during gameplay on a single level map.

In order to use a volume I'm assuming I'd need to match it to the Maze actors bounds (minus some padding) dynamically every time the maze's re-generate function fires. It isn't something I had considered or investigated. If I were to do it that way, there may be future use for a Nav Mesh Volume if that would work. I really have no idea how to use them yet though.

I'm pretty green. ;-)

avatar image xSheim Aug 22 '18 at 01:54 PM

Glad it helped. You can attach a volume to your actor (to detect overlaps you can use the Trigger Volume) and then dynamic resizing wouldn't be a problem. But I think it would be a different-topic question. As for the Nav Mesh you mentioned, it could help: https://answers.unrealengine.com/questions/223395/dynamic-navigation-mesh.html

avatar image LoneScrapBot Aug 22 '18 at 12:50 PM


Adding an IsValid check on the Player Pawn has stopped the error. Thank you so much. :-) Now I can live with my (quite possibly terrible) inside bounds test!

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