@@ -340,7 +340,7 @@ static function ( $reference ) use ( &$map ) {
 		// this is now an array of arrays of sources, translate to array of sources
 		$references = [];
 		foreach ( $temp as $sources ) {
-			if ( is_null( $sources ) ) {
+			if ( ! is_array( $sources ) ) {
 				continue;
 			}
 			array_push( $references, ...$sources );
Original file line number	Diff line number	Diff line change
`@@ -340,7 +340,7 @@ static function ( $reference ) use ( &$map ) {`
`340`	`340`	`// this is now an array of arrays of sources, translate to array of sources`
`341`	`341`	`$references = [];`
`342`	`342`	`foreach ( $temp as $sources ) {`
`343`		`- if ( is_null( $sources ) ) {`
	`343`	`+ if ( ! is_array( $sources ) ) {`
`344`	`344`	`continue;`
`345`	`345`	`}`
`346`	`346`	`array_push( $references, ...$sources );`