Blueprint runtime error help needed

Hello community members,

I have been working on a Udemy course and I am near completion. Recently, I have been getting a few Blueprint runtime errors, and for the life of me I cant figure it out. The error points to this branch node, and from what I can understand, its having an issue with the return output pin of the “Montage is Active” node. Could someone explain what is going on here and maybe point me in the right direction to learn more about them, or even help me solve this please and thanks.