diff --git a/pandora_server/lib/PandoraFMS/Tools.pm b/pandora_server/lib/PandoraFMS/Tools.pm
index 43b7db611b..8210830ada 100755
--- a/pandora_server/lib/PandoraFMS/Tools.pm
+++ b/pandora_server/lib/PandoraFMS/Tools.pm
@@ -612,6 +612,7 @@ sub set_file_permissions($$;$) {
 			my $uid  = getpwnam($pa_config->{'user'});
 			my $gid  = getgrnam($pa_config->{'group'});
 			my $perm = $grants & (~oct($pa_config->{'umask'}));
+			$gid = getgrnam("www-data") if (!defined($gid));
 
 			chown $uid, $gid, $file;
 			chmod ( $perm, $file );