Index: core/kernel/utility/validator.php
===================================================================
--- core/kernel/utility/validator.php
+++ core/kernel/utility/validator.php
@@ -202,7 +202,10 @@
 
 		if ( $params['type'] == 'string' || $res ) {
 			$f = 'is_' . $params['type'];
-			settype($val, $params['type']);
+
+			if ( is_scalar($val) ) {
+				settype($val, $params['type']);
+			}
 
 			$res = $f($val) && ($val == $this->dataSource->GetDBField($field));
 		}
@@ -228,10 +231,15 @@
 	{
 		$res = true;
 		$val = $this->dataSource->GetDBField($field);
+		$value_length = is_scalar($val) ? mb_strlen($val) : 0;
+
+		if ( !$value_length ) {
+			return true;
+		}
 
-		if ( isset($params['type']) && preg_match("#int|integer|double|float|real#", $params['type']) && strlen($val) > 0 ) {
-			// validate number
-			if ( isset($params['max_value_inc'])) {
+		if ( isset($params['type']) && preg_match('#int|integer|double|float|real#', $params['type']) ) {
+			// Validate number.
+			if ( isset($params['max_value_inc']) ) {
 				$res = $res && $val <= $params['max_value_inc'];
 				$max_val = $params['max_value_inc'].' (inclusive)';
 			}
@@ -250,43 +258,44 @@
 				$res = $res && $val > $params['min_value_exc'];
 				$min_val = $params['min_value_exc'].' (exclusive)';
 			}
-		}
 
-		if ( !$res ) {
-			if ( !isset($min_val) ) $min_val = '-&infin;';
-			if ( !isset($max_val) ) $max_val = '&infin;';
+			if ( !$res ) {
+				if ( !isset($min_val) ) {
+					$min_val = '-&infin;';
+				}
 
-			$this->SetError($field, 'value_out_of_range', null, array(
-				'min_value' => $min_val,
-				'max_value' => $max_val
-			));
+				if ( !isset($max_val) ) {
+					$max_val = '&infin;';
+				}
 
-			return false;
+				$this->SetError($field, 'value_out_of_range', null, array(
+					'min_value' => $min_val,
+					'max_value' => $max_val,
+				));
+			}
+
+			return $res;
 		}
 
-		if ( strlen($val) > 0 ) {
-			// Validate string.
-			if ( isset($params['max_len']) ) {
-				$res = $res && mb_strlen($val) <= $params['max_len'];
-			}
+		// Validate string.
+		if ( isset($params['max_len']) ) {
+			$res = $res && $value_length <= $params['max_len'];
+		}
 
-			if ( isset($params['min_len']) ) {
-				$res = $res && mb_strlen($val) >= $params['min_len'];
-			}
+		if ( isset($params['min_len']) ) {
+			$res = $res && $value_length >= $params['min_len'];
 		}
 
 		if ( !$res ) {
 			$error_params = array(
 				'min_length' => (int)getArrayValue($params, 'min_len'),
 				'max_length' => (int)getArrayValue($params, 'max_len'),
-				'value' => mb_strlen($val)
+				'value' => $value_length,
 			);
 			$this->SetError($field, 'length_out_of_range', null, $error_params);
-
-			return false;
 		}
 
-		return true;
+		return $res;
 	}
 
 	/**