Lots of StackOverflow Errors in Log

This gets printed out a zillion times in our logs:

WARN - error parsing file with regexp "((
.|[^"])*?)("|$) on file <stream> offset 1873, starting with: "VTWQABLTO
java.lang.StackOverflowError
at com.cenqua.fisheye.syntax.r.GroupHead.match(GroupHead.java:22)
at com.cenqua.fisheye.syntax.r.GroupTail.match(GroupTail.java:30)
at com.cenqua.fisheye.syntax.r.LazyLoop.match(LazyLoop.java:27)
at com.cenqua.fisheye.syntax.r.GroupTail.match(GroupTail.java:30)
at com.cenqua.fisheye.syntax.r.BitClass.match(BitClass.java:51)
at com.cenqua.fisheye.syntax.r.Branch.match(Branch.java:17)
at com.cenqua.fisheye.syntax.r.GroupHead.match(GroupHead.java:22)
at com.cenqua.fisheye.syntax.r.LazyLoop.match(LazyLoop.java:31)
at com.cenqua.fisheye.syntax.r.GroupTail.match(GroupTail.java:30)
at com.cenqua.fisheye.syntax.r.BitClass.match(BitClass.java:51)
at com.cenqua.fisheye.syntax.r.Branch.match(Branch.java:17)
at com.cenqua.fisheye.syntax.r.GroupHead.match(GroupHead.java:22)
<the trace loops forever>