[Groff] grohtml problem with .DS/.DE

[Heinz-Jürgen Oertel]

Hello,
Since I'm using the latest groff versions, like the CVS version downloaded 
today,
I have problems using .DS/.DE  and generating HTML output.

GNU groff version 1.20.1
do not generate correct code when detecting a .DS/.DE in groff source.

See attached file as an example input,

This is what is called to process the file:
groff -mwww -Thtml ds.t2

That is the error message generated:

groff: troff: Signal 11
post-grohtml:<standard input> (./index.t2):1189:warning: no final `x stop' 
command

I checked s.tmac. The definition of .DS has not changed compared with groff 
1.19.
May be I do a very basic failure, but please point me to it.
 Heinz

ds.t2
Description: Text document