diff -r 4a012e531066 -r 3caa3698335e mercurial/logcmdutil.py
--- a/mercurial/logcmdutil.py	Thu Feb 04 13:21:01 2021 -0800
+++ b/mercurial/logcmdutil.py	Thu Feb 04 13:32:11 2021 -0800
@@ -247,7 +247,7 @@
             ui,
             ctx.repo(),
             diffopts,
-            ctx.p1(),
+            diff_parent(ctx),
             ctx,
             match=self._makefilematcher(ctx),
             stat=stat,