* @param string $channel
* @param string $message
* @param array $context
- * @return null
+ * @return string
*/
protected static function formatAsWfDebugLog( $channel, $message, $context ) {
$time = wfTimestamp( TS_DB );
if ( is_nan( $item ) ) {
return 'NaN';
}
- return $item;
+ return (string)$item;
}
if ( is_scalar( $item ) ) {