Catch Throwables so that we handle internal PHP errors too

src/Api/ErrorHandler.php

@@ -12,6 +12,7 @@
 namespace Flarum\Api;
 
 use Exception;
+use Throwable;
 use Tobscure\JsonApi\Document;
 use Tobscure\JsonApi\ErrorHandler as JsonApiErrorHandler;
 
@@ -34,8 +35,12 @@ class ErrorHandler
      * @param Exception $e
      * @return JsonApiResponse
      */
-    public function handle(Exception $e)
+    public function handle(Throwable $e)
     {
+        if (! $e instanceof Exception) {
+            $e = new Exception($e->getMessage(), $e->getCode(), $e);
+        }
+
         $response = $this->errorHandler->handle($e);
 
         $document = new Document;

src/Api/Middleware/HandleErrors.php

@@ -11,12 +11,12 @@
 
 namespace Flarum\Api\Middleware;
 
-use Exception;
 use Flarum\Api\ErrorHandler;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Psr\Http\Server\MiddlewareInterface as Middleware;
 use Psr\Http\Server\RequestHandlerInterface as Handler;
+use Throwable;
 
 class HandleErrors implements Middleware
 {
@@ -40,7 +40,7 @@ class HandleErrors implements Middleware
     {
         try {
             return $handler->handle($request);
-        } catch (Exception $e) {
+        } catch (Throwable $e) {
             return $this->errorHandler->handle($e);
         }
     }