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It doesn't affect the game in any way, so you should't bother. It probably happens because you've played multiple rpgmaker games after each other and they contain different versions of the nw.js engine. You could get rid of it of course, but if you keep playing those games, it will reappear anyway.

- Go to your app data folder in Windows (C:\Users\[Your Username]\AppData\Local). If you can't find it, make sure you can see hidden folders. You can also type %LOCALAPPDATA%/ into the explorer bar to do the same.

- Delete the folder "nwjs".

- Go inside the folder 'User Data". Then go inside the folder "Default". Look for the files "Web Data" and "Web Data-journal". Delete these two files.

- In the app data folder, Go to Kadokawa\RPGMV\User Data\Default. Look for the files "Web Data" and "Web Data-journal". Delete these two files.