1 files changed, 3 insertions, 1 deletions
diff --git a/vendor/brick/math/src/BigNumber.php b/vendor/brick/math/src/BigNumber.php
index 44f26e35a..38c8c554e 100644
--- a/vendor/brick/math/src/BigNumber.php
+++ b/vendor/brick/math/src/BigNumber.php
@@ -81,7 +81,9 @@ abstract class BigNumber implements \Serializable, \JsonSerializable
             $throw();
         }
 
-        $getMatch = static fn(string $value): ?string => (($matches[$value] ?? '') !== '') ? $matches[$value] : null;
+        $getMatch = static function(string $value) use ($matches) : ?string {
+            return isset($matches[$value]) && $matches[$value] !== '' ? $matches[$value] : null;
+        };
 
         $sign        = $getMatch('sign');
         $numerator   = $getMatch('numerator');