Save on Quit?

[Richmond]

I wonder if anybody can tell me why this works as a stack, but doesn't 
as a standalone:

on mouseUp
    ---
    set the lockScreen to true
    delete file "BacktUp.rtf"
    if fld "DoneText" of card "Entry" of stack "RWord" is not empty then
       set the vis of img "SAVE" to true
       set the lockScreen to true
       put the RTFtext of fld "DoneText" of card "Entry" of stack 
"RWord" into url("file:" & BacktUp & ".rtf")
       set the lockScreen to false
       set the vis of img "SAVE" to false
    end if
    ---
    Quit
    ---
end mouseUp

Richmond.