Вопрос следующий. Плагин установил, приложение зарегистрировал, ключи настроил.
После возврата на fallback_url движок пишет в том же popup-окошке:
«Произошла ошибка при попытке загрузить страницу.»
Логи Laravel говорят следующее:
[2021-01-30 11:03:43] flarum.ERROR: TypeError: Return value of FoF\OAuth\Controller::getIdentifier() must be of the type string, null returned in /opt/flarum/vendor/fof/oauth/src/Controller.php:31
Stack trace:
#0 /opt/flarum/vendor/fof/extend/src/Controllers/AbstractOAuthController.php(89): FoF\OAuth\Controller->getIdentifier(Object(J4k\OAuth2\Client\Provider\VkontakteResourceOwner))
#1 /opt/flarum/vendor/fof/oauth/src/Controller.php(48): FoF\Extend\Controllers\AbstractOAuthController->handle(Object(Laminas\Diactoros\ServerRequest))
#2 /opt/flarum/vendor/fof/oauth/src/Controllers/AuthController.php(49): FoF\OAuth\Controller->handle(Object(Laminas\Diactoros\ServerRequest))
#3 /opt/flarum/vendor/flarum/core/src/Http/RouteHandlerFactory.php(38): FoF\OAuth\Controllers\AuthController->handle(Object(Laminas\Diactoros\ServerRequest))
#4 /opt/flarum/vendor/flarum/core/src/Http/Middleware/ExecuteRoute.php(27): Flarum\Http\RouteHandlerFactory->Flarum\Http\{closure}(Object(Laminas\Diactoros\ServerRequest), Array)
#5 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\ExecuteRoute->process(Object(Laminas\Diactoros\ServerRequest), Object(Closure))
#6 /opt/flarum/vendor/fof/masquerade/src/Middleware/DemandProfileCompletion.php(58): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#7 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): FoF\Masquerade\Middleware\DemandProfileCompletion->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#8 /opt/flarum/vendor/fof/ban-ips/src/Middleware/RegisterMiddleware.php(93): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#9 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): FoF\BanIPs\Middleware\RegisterMiddleware->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#10 /opt/flarum/vendor/fof/oauth/src/Middleware/ErrorHandler.php(50): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#11 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): FoF\OAuth\Middleware\ErrorHandler->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#12 /opt/flarum/vendor/fof/terms/src/Middlewares/RegisterMiddleware.php(48): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#13 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): FoF\Terms\Middlewares\RegisterMiddleware->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#14 /opt/flarum/vendor/flarum/core/src/Http/Middleware/ShareErrorsFromSession.php(57): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#15 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\ShareErrorsFromSession->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#16 /opt/flarum/vendor/flarum/core/src/Http/Middleware/CheckCsrfToken.php(40): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#17 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\CheckCsrfToken->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#18 /opt/flarum/vendor/flarum/core/src/Http/Middleware/ResolveRoute.php(67): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#19 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\ResolveRoute->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#20 /opt/flarum/vendor/flarum/core/src/Http/Middleware/SetLocale.php(50): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#21 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\SetLocale->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#22 /opt/flarum/vendor/flarum/core/src/Http/Middleware/AuthenticateWithSession.php(32): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#23 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\AuthenticateWithSession->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#24 /opt/flarum/vendor/flarum/core/src/Http/Middleware/RememberFromCookie.php(51): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#25 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\RememberFromCookie->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#26 /opt/flarum/vendor/flarum/core/src/Http/Middleware/StartSession.php(61): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#27 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\StartSession->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#28 /opt/flarum/vendor/flarum/core/src/Http/Middleware/CollectGarbage.php(46): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#29 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\CollectGarbage->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#30 /opt/flarum/vendor/flarum/core/src/Http/Middleware/ParseJsonBody.php(28): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#31 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\ParseJsonBody->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#32 /opt/flarum/vendor/flarum/core/src/Http/Middleware/HandleErrors.php(57): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#33 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Flarum\Http\Middleware\HandleErrors->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#34 /opt/flarum/vendor/laminas/laminas-stratigility/src/MiddlewarePipe.php(84): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#35 /opt/flarum/vendor/middlewares/request-handler/src/RequestHandler.php(84): Laminas\Stratigility\MiddlewarePipe->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#36 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Middlewares\RequestHandler->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#37 /opt/flarum/vendor/middlewares/base-path-router/src/BasePathRouter.php(97): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#38 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Middlewares\BasePathRouter->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#39 /opt/flarum/vendor/laminas/laminas-stratigility/src/Middleware/OriginalMessages.php(42): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#40 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Laminas\Stratigility\Middleware\OriginalMessages->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#41 /opt/flarum/vendor/middlewares/base-path/src/BasePath.php(53): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#42 /opt/flarum/vendor/laminas/laminas-stratigility/src/Next.php(61): Middlewares\BasePath->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\Next))
#43 /opt/flarum/vendor/laminas/laminas-stratigility/src/MiddlewarePipe.php(84): Laminas\Stratigility\Next->handle(Object(Laminas\Diactoros\ServerRequest))
#44 /opt/flarum/vendor/laminas/laminas-stratigility/src/MiddlewarePipe.php(73): Laminas\Stratigility\MiddlewarePipe->process(Object(Laminas\Diactoros\ServerRequest), Object(Laminas\Stratigility\EmptyPipelineHandler))
#45 /opt/flarum/vendor/laminas/laminas-httphandlerrunner/src/RequestHandlerRunner.php(96): Laminas\Stratigility\MiddlewarePipe->handle(Object(Laminas\Diactoros\ServerRequest))
#46 /opt/flarum/vendor/flarum/core/src/Http/Server.php(42): Laminas\HttpHandlerRunner\RequestHandlerRunner->run()
#47 /opt/flarum/public/index.php(26): Flarum\Http\Server->listen()
#48 {main}
В чём может быть проблема, на Ваш взгляд?