Crash when changing the fftsettings in the fluid.audiotransport~ help file

[MattS6464]

In the fluid.audiotransport~ help file second tab, an crash occurs when the fftsettings are changed whilst audio is playing. The crash occurs on fftsettings 256 16 256, fftsettings 1024 16 1024 and fftsettings 1024 -1 -1.
This is only happening in a debug/test build.