Bugfix.

Author: overtrue

src/Middleware/OAuthAuthenticate.php

@@ -59,7 +59,7 @@ public function handle($request, Closure $next, $account = 'default', $scope = n
         $enforceHttps = Arr::get($config, 'oauth.enforce_https', false);
 
         if ($request->has('code')) {
-            if (\is_callable($officialAccount->oauth, 'user')) {
+            if (\is_callable([$officialAccount->oauth, 'user'])) {
                 $user = $officialAccount->oauth->user();
             } else {
                 $user = $officialAccount->oauth->userFromCode($request->query('code'));