Humann2:"The condensed distance matrix must contain only finite values" when barplotting

Hi all,
Thanks in advance for the help.
I’ve been working quite a long time with HumanN2 on a metagenomics dataset and never had this error before, no i see it for several gene familie abundances. I have merged the samples, normalized them to cpm, regrouped and renamed them according to Kegg Orthology, hence the filename example

humann2_barplot -i “/120422_datasetx_genefamilies_merged_norm_KO_REGROUP_KO_RENAME_meta.tsv” -s similarity metadata -f K01428 -m TIMEANDFEEDING -o GraphX -g -r -w 1

gives the following:
"Regrouping to genera (before selecting/sorting strata)
Traceback (most recent call last):
File “/tools/software/bioinfo-tools/miniconda/miniconda3/envs/Humann2/bin/humann2_barplot”, line 11, in
sys.exit(main())
File “/tools/software/bioinfo-tools/miniconda/miniconda3/envs/Humann2/lib/python2.7/site-packages/humann2/tools/humann2_barplot.py”, line 349, in main
table.sort( method )
File “/tools/software/bioinfo-tools/miniconda/miniconda3/envs/Humann2/lib/python2.7/site-packages/humann2/tools/humann2_barplot.py”, line 256, in sort
order = sch.leaves_list( sch.linkage( norm.transpose(), metric=“braycurtis” ) )
File “/tools/software/bioinfo-tools/miniconda/miniconda3/envs/Humann2/lib/python2.7/site-packages/scipy/cluster/hierarchy.py”, line 1109, in linkage
raise ValueError(“The condensed distance matrix must contain only "
ValueError: The condensed distance matrix must contain only finite values.”

I have been plotting genes out of this dataset regularly, only today I noticed this one, and tried some more genes. occurs sometimes.
Any ideas what could be causing it, is the data formatting? Did an infinite value sneak in some where?
Thanks alot!
Best,
Patrick