it's a bug and no official response yet.
but some players have found a solution and posted on reddit
just search 'Objectives [Crashing, and Possible Cause]' on reddit
or add the line below after the official reddit address (since I'm not allowed to post website address)
r/foshelter/comment/3ibmnt/objectives_crashing_and_possilbe_cause/
Thanks! I will have to get Hubby to look at it, Ive no clue whatI am doing.
Frankly I think the lack of customer support is shocking! I emailed the game developers and recieved a basic holding email saying that I should post here. No attempt to actually help me (or anyone else as far as can see.) I am not very technically minded at all and am sure Im not the only one either. So telling me to go to yet another site that I have never heard of is of no use at all I expect more from such a big name developer.