At a guess: these antivirus programs usually work by matching tiny fragments of code using fast but approximate matching algorithms. It may not be able to to tell the difference between some innocuous string in that thread and a signature fragment from a piece of malicious code.

In which case there is nothing to be done except turn off the virus checker or get it fixed. It might be an idea to notify the virus checker company, they won't want their product to suffer from false positives.