Duplicate questions being asked

There should be a failsafe to stop a user from asking the exact same question multiple times. Due to the slow speed it takes from the time the user presses the ‘post question’ button to it being lodged, I have found many times where a user has pressed the button multiple times resulting in the same question being asked (up to 20 times).

There needs to be a way so that if the user asks exactly the same question they get an error popup.