Error 500 on some urls

[al3xLvs]

error on my log file.

[2020-03-30 05:36:30] production.ERROR: TypeError: Argument 2 passed to AmauryCarrade\FlarumFeeds\Controller\AbstractFeedController::getRelationship() must be an instance of stdClass, null given, called in /flarum/app/vendor/amaurycarrade/flarum-ext-syndication/src/Controller/DiscussionFeedController.php on line 104 and defined in /flarum/app/vendor/amaurycarrade/flarum-ext-syndication/src/Controller/AbstractFeedController.php:207
Stack trace:
#0 /flarum/app/vendor/amaurycarrade/flarum-ext-syndication/src/Controller/DiscussionFeedController.php(104): AmauryCarrade\FlarumFeeds\Controller\AbstractFeedController->getRelationship(Object(stdClass), NULL)
#1 /flarum/app/vendor/amaurycarrade/flarum-ext-syndication/src/Controller/AbstractFeedController.php(123): AmauryCarrade\FlarumFeeds\Controller\DiscussionFeedController->getFeedContent(Object(Laminas\Diactoros\ServerRequest))
#2 /flarum/app/vendor/flarum/core/src/Http/RouteHandlerFactory.php(38): AmauryCarrade\FlarumFeeds\Controller\AbstractFeedController->handle(Object(Laminas\Diactoros\ServerRequest))
#3 /flarum/app/vendor/flarum/core/src/Http/Middleware/DispatchRoute.php(65): Flarum\Http\RouteHandlerFactory->Flarum\Http\{closure}(Object(Laminas\Diactoros\ServerReque
st), Array)
#4 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\DispatchRoute->process(Object(Laminas\Diactoros\ServerRequest), Object(Closu
re))
#5 /flarum/app/vendor/flarum/core/src/Http/Middleware/ShareErrorsFromSession.php(56): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#6 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\ShareErrorsFromSession->process(Object(Laminas\Diactoros\ServerRequest), Obj
ect(Laminas\Stratigility\Next))
#7 /flarum/app/vendor/flarum/core/src/Http/Middleware/SetLocale.php(50): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#8 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\SetLocale->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\S
tratigility\Next))
#9 /flarum/app/vendor/flarum/core/src/Http/Middleware/CheckCsrfToken.php(23): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#10 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\CheckCsrfToken->process(Object(Laminas\Diactoros\ServerRequest), Object(Lam
inas\Stratigility\Next))
#11 /flarum/app/vendor/flarum/core/src/Http/Middleware/AuthenticateWithSession.php(32): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#12 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\AuthenticateWithSession->process(Object(Laminas\Diactoros\ServerRequest), O
bject(Laminas\Stratigility\Next))
#13 /flarum/app/vendor/flarum/core/src/Http/Middleware/RememberFromCookie.php(51): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#14 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\RememberFromCookie->process(Object(Laminas\Diactoros\ServerRequest), Object
(Laminas\Stratigility\Next))
#15 /flarum/app/vendor/flarum/core/src/Http/Middleware/StartSession.php(61): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#16 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\StartSession->process(Object(Laminas\Diactoros\ServerRequest), Object(Lamin
as\Stratigility\Next))
#17 /flarum/app/vendor/flarum/core/src/Http/Middleware/CollectGarbage.php(46): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#18 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\CollectGarbage->process(Object(Laminas\Diactoros\ServerRequest), Object(Lam
inas\Stratigility\Next))
#19 /flarum/app/vendor/flarum/core/src/Http/Middleware/ParseJsonBody.php(28): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#20 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\ParseJsonBody->process(Object(Laminas\Diactoros\ServerRequest), Object(Lami
nas\Stratigility\Next))
#21 /flarum/app/vendor/flarum/core/src/Http/Middleware/HandleErrors.php(57): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#22 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\HandleErrors->process(Object(Laminas\Diactoros\ServerRequest), Object(Lamin
as\Stratigility\Next))
#23 /flarum/app/vendor/laminas/laminas-stratigility/src/MiddlewarePipe.php(84): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#24 /flarum/app/vendor/middlewares/request-handler/src/RequestHandler.php(84): Laminas\Stratigility\MiddlewarePipe->process(Object(Laminas\Diactoros\ServerRequest), Obj
ect(Laminas\Stratigility\Next))
#25 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Middlewares\RequestHandler->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Strati
gility\Next))
#26 /flarum/app/vendor/middlewares/base-path-router/src/BasePathRouter.php(97): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#27 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Middlewares\BasePathRouter->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Strati
gility\Next))
#28 /flarum/app/vendor/laminas/laminas-stratigility/src/Middleware/OriginalMessages.php(42): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#29 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Laminas\Stratigility\Middleware\OriginalMessages->process(Object(Laminas\Diactoros\ServerRequest),
 Object(Laminas\Stratigility\Next))
#30 /flarum/app/vendor/middlewares/base-path/src/BasePath.php(53): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#31 /flarum/app/vendor/laminas/laminas-stratigility/src/Next.php(61): Middlewares\BasePath->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility
\Next))
#32 /flarum/app/vendor/laminas/laminas-stratigility/src/MiddlewarePipe.php(84): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#33 /flarum/app/vendor/laminas/laminas-stratigility/src/MiddlewarePipe.php(73): Laminas\Stratigility\MiddlewarePipe->process(Object(Laminas\Diactoros\ServerRequest), Ob
ject(Laminas\Stratigility\EmptyPipelineHandler))
#34 /flarum/app/vendor/laminas/laminas-httphandlerrunner/src/RequestHandlerRunner.php(96): Laminas\Stratigility\MiddlewarePipe->handle(Object(Laminas\Diactoros\ServerRe
quest))
#35 /flarum/app/vendor/flarum/core/src/Http/Server.php(42): Laminas\HttpHandlerRunner\RequestHandlerRunner->run()
#36 /flarum/app/public/index.php(26): Flarum\Http\Server->listen()
#37 {main}

[splitbrain]

I can confirm this problem. I'm getting the same on the main /atom feed

[splitbrain]

I believe the problem occurs when a user is deleted but the post remains. The post will have NULL as the user and thus no relation is passed. The same happens in the DiscussionsActivityFeedController.

I think the code needs to check if the relationship exists before using it, falling back to the username [deleted] otherwise