D25180.1740001968.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
	@@ -789,6 +789,9 @@
	* @phutil-external-symbol function mb_convert_case
	*/
	function phutil_utf8_strtolower($str) {
	+ if ($str === null) {
	+ return '';
	+ }
	if (function_exists('mb_convert_case')) {
	return mb_convert_case($str, MB_CASE_LOWER, 'UTF-8');
	}
	@@ -800,7 +803,7 @@
	range('a', 'z'));
	}

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