On 5 Jan 2018, at 14:21, Hans Hagen <pragma@wxs.nl> wrote:
[…]
hm, soon that will be 1.07 ... anyway, as a quick hack you can change it in context.mkiv to 1.05

Many thanks for your quick answer.
I just did change 
\ifnum\luatexversion<106
into
\ifnum\luatexversion<105

and rebuilt the formats: everything works fine as far as I am concerned…

Best regards: OK