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This query compares the average 'time to first answer' across the network (for an adjustable time period; default is the first half of 2018). Answers which are later deleted aren't counted, and I should probably exclude self-answered questions but I doubt that will make much of a difference. Here...
Null Pointer exceptions usually mean you haven't assigned a value to whatever the problem is pointing to. Or maybe your menuItem doesn't exist. Is your dad gonna stick his dick to make in-null? NO! You have to assign it a value!
