We need a report following the guidelines to be able to help. This means a minimal project that reproduces the issue, ideally immediately and without any interaction required.
Further, if the issue is exclusive to NW.js and does not affect any other platforms, then it is probably a bug with NW.js itself. In that case there's nothing we can do about it, so you may do better to report it directly to the NW.js developers. However they will also need a minimal project that reproduces the issue to be able to help.