IDE crash

[Tenaja]

I was in the middle of editing a file when the IDE crashed. I got this report:

An Error has been detected in the IDE!
Error: Invalid memory access
File: C:\purebasic\svn\v5.30\Fr34k\PureBasicIDE\EditHistory.pb
Line: 521

IDE build on 09/01/2014 [17:28] by Fred
Branch: v5.30 Revision: 1660

The Help-About box says I am on 5.31 Beta 1
Windows 7-64, running the x86 version.