BigBrain assumes any mob is a GroundPathNavigator when isFlying() is false. But many modded mobs have unique path navigators and thus should not be given to RestrictSunGoal. I would like to fix this on the Alex's Mobs end but that cannot be done.

Possible fixes:

• assign new AI that can potentially cause crashes to ONLY vanillla mobs
• properly check if a mob's navigator is GroundPathNavigator rather than leave the vanilla, crash-causing logic there'
• create a new RestrictSunGoal that is compatible with any possible PathNavigator.

issues reported:

• AlexModGuy/AlexsMobs#733
• AlexModGuy/AlexsMobs#707

Code triggering the error is here:
https://github.com/seymourimadeit/Big-Brain/blob/main/src/main/java/tallestegg/bigbrain/BigBrainEvents.java#L321