diff -r 468797392cc6 -r c0f8fa74d8c2 mercurial/context.py
--- a/mercurial/context.py	Fri May 18 19:54:50 2018 -0400
+++ b/mercurial/context.py	Fri May 18 20:11:24 2018 -0400
@@ -432,7 +432,7 @@
             # lookup failed
         except (error.FilteredIndexError, error.FilteredLookupError):
             raise error.FilteredRepoLookupError(_("filtered revision '%s'")
-                                                % changeid)
+                                                % pycompat.bytestr(changeid))
         except error.FilteredRepoLookupError:
             raise
         except IndexError: