--- a/hgext3rd/evolve/evolvecmd.py	Fri Mar 23 19:16:25 2018 +0530
+++ b/hgext3rd/evolve/evolvecmd.py	Fri Mar 23 19:36:08 2018 +0530
@@ -253,7 +253,8 @@
                 bumped = tmpctx
                 rebasedbmupdate = _bookmarksupdater(repo, bumped.node(), tr)
         except MergeFailure:
-            repo.vfs.write('graftstate', bumped.hex() + '\n')
+            evolvestate['current'] = bumped.hex()
+            evolvestate.save()
             repo.ui.write_err(_('evolution failed!\n'))
             msg = _("fix conflict and run 'hg evolve --continue'\n")
             repo.ui.write_err(msg)