1 files changed, 1 insertions, 1 deletions
diff --git a/src/WebAssembly/Execution/StackOverflowException.php b/src/WebAssembly/Execution/StackOverflowException.php
index c5ff3a4..4a18aa7 100644
--- a/src/WebAssembly/Execution/StackOverflowException.php
+++ b/src/WebAssembly/Execution/StackOverflowException.php
@@ -12,7 +12,7 @@ final class StackOverflowException extends RuntimeException
     public function __construct(
         string $message = 'Stack overflow',
         int $code = 0,
-        Throwable $previous = null,
+        ?Throwable $previous = null,
     ) {
         parent::__construct($message, $code, $previous);
     }