BUG - Threshold Ranges raising isn't numeric in multiplication messages

[hugleo]

./check_nwc_health --critical 1.0:10.0 --hostname 192.168.0.1 --community public --mode interface-usage --name fe-0/0

Argument "1.0:10.0" isn't numeric in multiplication () at ./check_nwc_health line 85509.
Argument "1.0:10.0" isn't numeric in multiplication () at ./check_nwc_health line 85525.
CRITICAL - interface fe-0/0...

The result CRITICAL looks OK for the scenery. Looks is respecting the format https://nagios-plugins.org/doc/guidelines.html#THRESHOLDFORMAT pretty good but is showing the annoying messages: "isn't numeric in multiplication"

/check_nwc_health --version
check_nwc_health $Revision: 10.8.0.3 $ [http://labs.consol.de/nagios/check_nwc_health]