--- a/Plugins/VcsPlugins/vcsMercurial/HgDiffGenerator.py	Thu Mar 21 19:26:10 2019 +0100
+++ b/Plugins/VcsPlugins/vcsMercurial/HgDiffGenerator.py	Thu Mar 21 19:27:42 2019 +0100
@@ -146,7 +146,7 @@
             while not os.path.isdir(os.path.join(repodir, self.vcs.adminDir)):
                 repodir = os.path.dirname(repodir)
                 if os.path.splitdrive(repodir)[1] == os.sep:
-                    return
+                    return False
             
             self.process.kill()
             self.process.setWorkingDirectory(repodir)