[rrdtool-maint] RRD Tool "Line0" is not processed any more

[Al ois]

Hello,

I have updated my system from wheezy to stretch.
I had a lot munin-graphs working with "LINE0" as draw option in debian wheezy (rrdtool 1.4.7-2), all those graphs cannot be drawed any more, in debian stretch (rrdtool 1.6.0-1+b2) "Line0" generates the following error in munin-graph.log:
[RRD ERROR] Unable to graph /path/to/my/png.png : Bad line width: 0
[RRD ERROR] rrdtool 'graph' '/path/to/my/png.png'

my munin configuration did not change, as soon as I change it to "LINE1" it is drawed correct (but of course I would like to not draw the affected values 😉 )

Thanks for any hints what I can try or if this needs to be fixed.

BR
Alois