diff -r 7d417ab1eda9 -r c3522b015f81 mercurial/manifest.py
--- a/mercurial/manifest.py	Thu Mar 14 11:46:18 2019 +0000
+++ b/mercurial/manifest.py	Fri Mar 15 09:07:23 2019 +0000
@@ -1437,6 +1437,9 @@
             return
 
         self._fulltextcache._opener = repo.cachevfs
+        if repo._currentlock(repo._lockref) is None:
+            return
+
         reporef = weakref.ref(repo)
         manifestrevlogref = weakref.ref(self)
 
@@ -1450,8 +1453,7 @@
                 return
             self._fulltextcache.write()
 
-        if repo._currentlock(repo._lockref) is not None:
-            repo._afterlock(persistmanifestcache)
+        repo._afterlock(persistmanifestcache)
 
     @property
     def fulltextcache(self):