lib/PublicInbox/Git.pm | 5 +++--

diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index 9a38d7c8dce83bc0aa13d0ee870ab33924390580..9014e021cedcb9084ac50eea515e0a71119f1e94 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -211,9 +211,10 @@ 	($hex, $type, $size);
 }
 
 sub _destroy {
-	my ($self, $in, $out, $pid) = @_;
+	my ($self, $in, $out, $pid, $err) = @_;
 	my $p = delete $self->{$pid} or return;
 	delete @$self{($in, $out)};
+	delete $self->{$err} if $err; # `err_c'
 	waitpid $p, 0;
 }
 
@@ -243,7 +244,7 @@ # returns true if there are pending "git cat-file" processes
 sub cleanup {
 	my ($self) = @_;
 	_destroy($self, qw(in out pid));
-	_destroy($self, qw(in_c out_c pid_c));
+	_destroy($self, qw(in_c out_c pid_c err_c));
 	!!($self->{pid} || $self->{pid_c});
 }