Pull requests cannot be merged in repositories with extremely short slugs

2013-11-20 09:24:11,689 ERROR [http-bio-7990-exec-9] user 564x3264x0 5raokm 1.1.1.1 "POST /rest/api/latest/projects/UI/repos/ui/pull-requests/56/merge HTTP/1.1" c.a.s.r.e.UnhandledExceptionMapper Unhandled exception while processing REST call
java.lang.IllegalArgumentException: Prefix string too short
at java.io.File.createTempFile(File.java:1794) ~[na:1.6.0_18]
at com.atlassian.stash.util.FileUtils.createTempDir(FileUtils.java:52) ~[stash-util-2.9.1.jar:na]
at com.atlassian.stash.internal.scm.git.porcelain.ShinyGitPorcelain.createWorkTree(ShinyGitPorcelain.java:201) ~[na:na]
at com.atlassian.stash.internal.scm.git.porcelain.ShinyGitPorcelain.workTree(Shin
yGitPorcelain.java:108) ~[na:na]
at com.atlassian.stash.internal.scm.git.porcelain.AbstractWorkTreeCommand.call(AbstractWorkTreeCommand.java:36) ~[na:na]