Oh. I have downloaded version 1.6.0 and there is this error is this version. The problem is fixed in 1.6.1. The responsible is the nearstars.stc in the data folder.
To be pedantic, it is NOT in 1.6.1, it is on trunk (which is effectively 1.7). The version of the file in 1.6.1 still has this bug. I've mentioned this on the developers' list (and also want to get some clarification on when 1.6.1 is going to go, Chris L mentioned he was ready to go with the release about a month ago, but things have been silent since then).