Was it an old version of Notepad++?
If so, it was only a problem briefly back in around 2014, I think, so if you update to the latest Notepad++ it should fix things.
For my own curiosity, I would love to know why so many people seem to have that problem version of Notepad++. We still get a lot of reports about it, and it's odd given how old the problem Notepad++ version was and how quickly it was replaced with a fixed version.
Is something else installing that particular version of Notepad++ on lots of people's machines, as part of a package? If so it'd be good to know what it is so we can tell them to update the version they're giving people to prevent more crashes.
Or is it a recent version of Notepad++ and the bug has come back?