Steps to reproduce:
1. Download the NPP portable 6.2.3 Unicode version
2. Unpack it in Windows 7 64 bit
3. Install XPatherizerNPP via Plugin Manager
4. Open an xml file in NPP
5. Close NPP
6. Open anotther xml file in NPP
7. Close NPP - when closing NPP it will crash. No dmp file is produced.