Javascript Clientside: Prevent custom chat from activating

[Vennox 2]

So i m using this custom chat:

along with a dialog system with input boxes. The problem is that, when the player types someting with the letter T in the input box, the chat activates as it was a message (Ex. if the player types "potato" in the input box, the chat input will display "ato")

Is there a way to block this?

[Division 9]

idk this script but I would try to block the 'T'-key when cursor is available or do smt like a flag if chat is active.