So this is not my normal type of game that I play but I love it! The only problem I've in counted is the objective bug! I can compleat objectives but I can't go see what's next, as soon as I tap the icon the game crashes! It is a bit entertaining to try an figure out what that can be, but still not really how it's supposed to work! Now as I have 170+ dwellers and countless rooms, there are times where everything is running smoothly that the objectives are the only thing keeping me playing! This flooping bug is becoming highly annoying! Apart from the obvious deleting the app and reinstalling it (which is not an option) and waiting for a patch to fix this can anyone suggest anything that may help

This is a link pointing to a discussion in reddit with a fix for your problem. It shouldn't be too hard https://m.reddit.com/r/foshelter/comments/3iii8d/found_and_fixed_the_crashing_objectives_bug/