diff --git a/app/Config/Constants.php b/app/Config/Constants.php
index 0c1b53487cd9..47b92f832935 100644
--- a/app/Config/Constants.php
+++ b/app/Config/Constants.php
@@ -67,16 +67,16 @@
  |       http://tldp.org/LDP/abs/html/exitcodes.html
  |
  */
-defined('EXIT_SUCCESS')        || define('EXIT_SUCCESS', 0); // no errors
-defined('EXIT_ERROR')          || define('EXIT_ERROR', 1); // generic error
-defined('EXIT_CONFIG')         || define('EXIT_CONFIG', 3); // configuration error
-defined('EXIT_UNKNOWN_FILE')   || define('EXIT_UNKNOWN_FILE', 4); // file not found
-defined('EXIT_UNKNOWN_CLASS')  || define('EXIT_UNKNOWN_CLASS', 5); // unknown class
+defined('EXIT_SUCCESS')        || define('EXIT_SUCCESS', 0);        // no errors
+defined('EXIT_ERROR')          || define('EXIT_ERROR', 1);          // generic error
+defined('EXIT_CONFIG')         || define('EXIT_CONFIG', 3);         // configuration error
+defined('EXIT_UNKNOWN_FILE')   || define('EXIT_UNKNOWN_FILE', 4);   // file not found
+defined('EXIT_UNKNOWN_CLASS')  || define('EXIT_UNKNOWN_CLASS', 5);  // unknown class
 defined('EXIT_UNKNOWN_METHOD') || define('EXIT_UNKNOWN_METHOD', 6); // unknown class member
-defined('EXIT_USER_INPUT')     || define('EXIT_USER_INPUT', 7); // invalid user input
-defined('EXIT_DATABASE')       || define('EXIT_DATABASE', 8); // database error
-defined('EXIT__AUTO_MIN')      || define('EXIT__AUTO_MIN', 9); // lowest automatically-assigned error code
-defined('EXIT__AUTO_MAX')      || define('EXIT__AUTO_MAX', 125); // highest automatically-assigned error code
+defined('EXIT_USER_INPUT')     || define('EXIT_USER_INPUT', 7);     // invalid user input
+defined('EXIT_DATABASE')       || define('EXIT_DATABASE', 8);       // database error
+defined('EXIT__AUTO_MIN')      || define('EXIT__AUTO_MIN', 9);      // lowest automatically-assigned error code
+defined('EXIT__AUTO_MAX')      || define('EXIT__AUTO_MAX', 125);    // highest automatically-assigned error code
 
 /**
  * @deprecated Use \CodeIgniter\Events\Events::PRIORITY_LOW instead.
diff --git a/system/Debug/Exceptions.php b/system/Debug/Exceptions.php
index 736a67fa9711..3ec1230291ea 100644
--- a/system/Debug/Exceptions.php
+++ b/system/Debug/Exceptions.php
@@ -14,6 +14,7 @@
 use CodeIgniter\API\ResponseTrait;
 use CodeIgniter\Exceptions\PageNotFoundException;
 use CodeIgniter\HTTP\CLIRequest;
+use CodeIgniter\HTTP\Exceptions\HTTPException;
 use CodeIgniter\HTTP\IncomingRequest;
 use CodeIgniter\HTTP\Response;
 use Config\Exceptions as ExceptionsConfig;
@@ -115,7 +116,14 @@ public function exceptionHandler(Throwable $exception)
         }
 
         if (! is_cli()) {
-            $this->response->setStatusCode($statusCode);
+            try {
+                $this->response->setStatusCode($statusCode);
+            } catch (HTTPException $e) {
+                // Workaround for invalid HTTP status code.
+                $statusCode = 500;
+                $this->response->setStatusCode($statusCode);
+            }
+
             if (! headers_sent()) {
                 header(sprintf('HTTP/%s %s %s', $this->request->getProtocolVersion(), $this->response->getStatusCode(), $this->response->getReasonPhrase()), true, $statusCode);
             }