lib/PublicInbox/GitHTTPBackend.pm | 1 +

diff --git a/lib/PublicInbox/GitHTTPBackend.pm b/lib/PublicInbox/GitHTTPBackend.pm
index 4d2816a00c4b92b8a9b562906b9d944f567eadaa..6efe5b31d485086b0f4c4825a98b52c5180d9e60 100644
--- a/lib/PublicInbox/GitHTTPBackend.pm
+++ b/lib/PublicInbox/GitHTTPBackend.pm
@@ -280,6 +280,7 @@ 		unless (defined $r) {
 			err($env, "error reading input: $!");
 			return;
 		}
+		last if $r == 0;
 		my $off = 0;
 		while ($r > 0) {
 			my $w = syswrite($in, $buf, $r, $off);