--- a/mercurial/revset.py	Sat May 05 00:16:43 2018 -0700
+++ b/mercurial/revset.py	Mon May 07 14:32:43 2018 -0700
@@ -1336,6 +1336,8 @@
             pm = repo.changelog._partialmatch(n)
             if pm is not None:
                 rn = repo.changelog.rev(pm)
+        except LookupError:
+            pass
         except error.WdirUnsupported:
             rn = node.wdirrev