Hi!

I'm trying to use Context to export a document to epub.
Following the instructions on Contextgarden everything works up to a point:

When I add manual hyphenation for the word "Trennalgorithmus" and
\setupbackend[export=yes,xhtml=yes]
I get:

lua error       > error on line 1 in file /Volumes/Macintosh HD/Users/axel/Documents/Text/Dokumente_LaTeX/context/Dante 2015/Dominik Wagenführ - ePub/epub/epub_bug.tex:

.../context/tex/texmf-context/tex/context/base/back-exp.lua:2516: bad argument #1 to 'utfchar' (invalid value)
stack traceback:
	[C]: in function 'utfchar'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2516: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2687: in function 'collectresults'
	.../context/tex/texmf-context/tex/context/base/back-exp.lua:2752: in function 'nodes_handlers_export'
	[string "local nodes_handlers_cleanuppage = nodes.hand..."]:18: in function <[string "local nodes_handlers_cleanuppage = nodes.hand..."]:10>
	(...tail calls...)
	.../context/tex/texmf-context/tex/context/base/node-shp.lua:171: in function 'finalizebox'
	[\directlua]:1: in main chunk

 1 >>  % !TEX encoding = UTF-8 Unicode

See attached log file.

If I remove the hyphenation, everything works, but the hyphenation is wrong.

I'm using:
current version: 2015.02.03 23:55

Greetings Axel