diff --git a/src/Reflection/SignatureMap/functionMap.php b/src/Reflection/SignatureMap/functionMap.php
index <HASH>..<HASH> 100644
--- a/src/Reflection/SignatureMap/functionMap.php
+++ b/src/Reflection/SignatureMap/functionMap.php
@@ -10029,7 +10029,7 @@ return [
 'SessionUpdateTimestampHandlerInterface::updateTimestamp' => ['bool', 'key'=>'string', 'val'=>'string'],
 'SessionUpdateTimestampHandlerInterface::validateId' => ['bool', 'key'=>'string'],
 'set_error_handler' => ['?callable', 'error_handler'=>'callable', 'error_types='=>'int'],
-'set_exception_handler' => ['callable', 'exception_handler'=>'callable'],
+'set_exception_handler' => ['?callable', 'exception_handler'=>'callable'],
 'set_file_buffer' => ['int', 'fp'=>'resource', 'buffer'=>'int'],
 'set_include_path' => ['string', 'new_include_path'=>'string'],
 'set_magic_quotes_runtime' => ['bool', 'new_setting'=>'bool'],
Marked return type of `\set_exception_handler()` as nullable