Awesome!
Okay so now we are pretty sure that it wasn’t the decrement at all. It’s the reference!
Try bringing down that “Item to Pickup” reference to right above the “Server Apply Damage” and do an IsValid check on it (keep it connected to the node it’s connected to as well). Throw that isValid between “Server Apply Damage” and “Set Members…” and put in a PrintString with an error message (for you!) saying something like “Hey, you don’t have that reference!” coming out of the False on the isValid.
We gotta make sure that reference is stable, or you get Accessed none!