The following code (in the command bar or a script) crashes Roblox (both in Studio and in live servers):
mss = game:GetService("MemoryStoreService")
test = mss:GetSortedMap("Test")
test:UpdateAsync("0", function() end, 1)
Expected behaviour: Either interpret not returning anything as a cancelled update or error.
Note: returning nil
cancels the update as expected.