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	diff --git a/includes/media/FormatMetadata.php b/includes/media/FormatMetadata.php
	index 0c818ef4f91..9de25e9e669 100644
	--- a/includes/media/FormatMetadata.php
	+++ b/includes/media/FormatMetadata.php
	@@ -1380,6 +1380,7 @@ class FormatMetadata extends ContextSource {
	*/
	private function formatFraction( $num ) {
	$m = [];
	+ $num ??= '';
	if ( preg_match( '/^(-?\d+)\/(\d+)$/', $num, $m ) ) {
	$numerator = (int)$m[1];
	$denominator = (int)$m[2];