D25180.1740001910.diff
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	diff --git a/src/utils/utf8.php b/src/utils/utf8.php
	--- a/src/utils/utf8.php
	+++ b/src/utils/utf8.php
	@@ -789,18 +789,22 @@
	* @phutil-external-symbol function mb_convert_case
	*/
	function phutil_utf8_strtolower($str) {
	- if (function_exists('mb_convert_case')) {
	- return mb_convert_case($str, MB_CASE_LOWER, 'UTF-8');
	- }
	+ if (phutil_nonempty_stringlike($str)) {
	+ if (function_exists('mb_convert_case')) {
	+ return mb_convert_case($str, MB_CASE_LOWER, 'UTF-8');
	+ }

	- static $map;
	- if ($map === null) {
	- $map = array_combine(
	- range('A', 'Z'),
	- range('a', 'z'));
	- }
	+ static $map;
	+ if ($map === null) {
	+ $map = array_combine(
	+ range('A', 'Z'),
	+ range('a', 'z'));
	+ }

	- return phutil_utf8_strtr($str, $map);
	+ return phutil_utf8_strtr($str, $map);
	+ } else {
	+ return '';
	+ }
	}