diff -r e338a921a0cd -r 485a3349d5ee hgext/rebase.py
--- a/hgext/rebase.py	Fri Aug 17 10:19:17 2018 +0900
+++ b/hgext/rebase.py	Fri Aug 17 10:21:25 2018 +0900
@@ -864,7 +864,7 @@
         except error.InMemoryMergeConflictsError:
             ui.warn(_('hit merge conflicts; re-running rebase without in-memory'
                       ' merge\n'))
-            _dorebase(ui, repo, 'abort', opts)
+            _dorebase(ui, repo, action='abort', opts={})
             return _dorebase(ui, repo, action, opts, inmemory=False)
     else:
         return _dorebase(ui, repo, action, opts)