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	Index: branches/5.2.x/core/kernel/utility/validator.php
	===================================================================
	--- branches/5.2.x/core/kernel/utility/validator.php
	+++ branches/5.2.x/core/kernel/utility/validator.php
	@@ -264,13 +264,15 @@
	return false;
	}

	- // validate string
	- if ( isset($params['max_len']) ) {
	- $res = $res && mb_strlen($val) <= $params['max_len'];
	- }
	+ if ( strlen($val) > 0 ) {
	+ // Validate string.
	+ if ( isset($params['max_len']) ) {
	+ $res = $res && mb_strlen($val) <= $params['max_len'];
	+ }

	- if ( isset($params['min_len']) ) {
	- $res = $res && mb_strlen($val) >= $params['min_len'];
	+ if ( isset($params['min_len']) ) {
	+ $res = $res && mb_strlen($val) >= $params['min_len'];
	+ }
	}

	if ( !$res ) {