lib/PublicInbox/WWW.pm | 1 +

diff --git a/lib/PublicInbox/WWW.pm b/lib/PublicInbox/WWW.pm
index 78b8826e2287ae9cdd29a5d30cf4cdc695f2df32..f88894a0d02810d51c2926a8ba9915bec256c306 100644
--- a/lib/PublicInbox/WWW.pm
+++ b/lib/PublicInbox/WWW.pm
@@ -47,6 +47,7 @@
 	# we don't care about multi-value
 	my %qp = map {
 		my ($k, $v) = split('=', $_, 2);
+		$v = '' unless defined $v;
 		($k, $v)
 	} split(/[&;]/, uri_unescape($env->{QUERY_STRING}));
 	$ctx->{qp} = \%qp;