I will look into this, you can help by double clicking on that “Branch Graph” also that “set value as Bool Graph” and send me a screenshot of where it takes you. it will take you directly to where the error is happening and is much easier to diagnose that way.
A few questions.
Is this error happening when shooting the Birds?
Are your Birds set to “disable collision during flight”?
Is your projectile “destroying” characters?
so far I’m unable to reproduce these errors.