OneSignal "Cannot read property "get" of null at eval"

Hey there! Trying to set up notifications on Bubble using OneSignal. I keep getting an error message that says “Cannot read property “get” of null at eval” when a message gets sent out. Any idea what’s happening here and how I can fix it?

what’s your action setup? sounds like the value list of receivers is being interpreted as null, but a bit hard to say without more info!

I have

  1. Click on Follower Button
  2. Change Follower Count
  3. Send OneSignal notification to Post Creator’s Player ID 1