Prevent opening window when windows_id is not defined
Prevent opening window when windows_id is not defined

ondra-novak/nw.js,ondra-novak/nw.js,ondra-novak/nw.js,ondra-novak/nw.js,ondra-novak/nw.js,ondra-novak/nw.js,ondra-novak/nw.js