diff --git a/src/Analyser/TypeSpecifierContext.php b/src/Analyser/TypeSpecifierContext.php
index acfe6ba2c8..d7379c26ac 100644
--- a/src/Analyser/TypeSpecifierContext.php
+++ b/src/Analyser/TypeSpecifierContext.php
@@ -27,8 +27,9 @@ private function __construct(private ?int $value)
 
 	private static function create(?int $value): self
 	{
-		self::$registry[$value] ??= new self($value);
-		return self::$registry[$value ?? ''];
+		$key = $value ?? '';
+		self::$registry[$key] ??= new self($value);
+		return self::$registry[$key];
 	}
 
 	public static function createTrue(): self