The tag is present in Lintian version 2.104.232. That is the most recent version we know about.
The version number of your source package ends in +b and a number or has a Debian revision containing three parts. These version numbers are used by binary NMUs and should not be used as the source version. (The +b form is the current standard; the three-part version number now obsolete.)
Refer to Debian Developer's Reference section 126.96.36.199 for details.