Assertion fails in 3.0 beta while trying to edit multiple files

WinSCP 3.0 beta (build 159 ) throws an asserion failure when trying to edit more than 1 file (selected multiple files with ctrl and selected Edit from right click menu)

The actual error text is "Assertion failed: FileList->Count == 1, file C:\Martin\Projecty\WinSCP2\forms\CustomScpExplorer .cpp, line 436"

Thanks for letting me know.