lib/PublicInbox/LeiSearch.pm | 3 ++-

diff --git a/lib/PublicInbox/LeiSearch.pm b/lib/PublicInbox/LeiSearch.pm
index f9e5c8e9846ca4ab7c9626f31d77b9fd97dda176..47160ed98b7a81a4988cd9187fb8afd55a177217 100644
--- a/lib/PublicInbox/LeiSearch.pm
+++ b/lib/PublicInbox/LeiSearch.pm
@@ -64,7 +64,8 @@ 				$x = xap_terms('L', $doc);
 				%L = (%L, %$x);
 			}
 		};
-		warn "$$ $0 #$num (nshard=$self->{nshard}) $smsg->{blob}: $@";
+		warn "$$ $0 #$num (nshard=$self->{nshard}) $smsg->{blob}: $@"
+			if $@;
 	}
 	$smsg->{kw} = [ sort keys %kw ] if scalar(keys(%kw));
 	$smsg->{L} = [ sort keys %L ] if scalar(keys(%L));