Blueprint Runtime Error: "Accessed None trying to read property K2Node_DynamicCast

HI am getting an error that pops up now when an AI seems to follow my player going through a trigger box which controls a blend camera.
Was working fine when it was just the player on its own, but as soon as I add the AI character this pops up
Ive tried to use a branch to check if the overlapping actor is the player but that did not work and cannot work out where the error is. Please could someone help as I am more of an artist as apposed a programmer

Do not attempt to use data from another execution flow, there’s no guarantee it’s valid.

If you need to access the data in the very bottom part of the script, you must also perform the cast there.

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Thankyou!!!
A few more hours to sit through tutorials me thinks