[dev-context] Assertion failure with latest luatex

Hi, I am using LuaTeX, Version snapshot-0.23.0-2008030822 and context 2008.03.04. In a long article, I get an error: luatex: ../../../../src/texk/web2c/luatexdir/tex/linebreak.c:215: find_protchar_right: Assertion `varmem[(varmem[((r)+1)].hh.v.RH)].hh.v.RH==r' failed. Is this a known bug? If not, I can try to create a minimal example. Aditya