--- a/mercurial/revlog.py	Mon May 03 18:41:51 2021 +0200
+++ b/mercurial/revlog.py	Mon May 03 20:22:34 2021 +0200
@@ -1810,7 +1810,8 @@
                 if inline:
                     chunkstart += (rev + 1) * iosize
                 chunklength = length(rev)
-                ladd(decomp(buffer(data, chunkstart - offset, chunklength)))
+                c = buffer(data, chunkstart - offset, chunklength)
+                ladd(decomp(c))
 
         return l