Upgrade to Laravel 5.8 and AdminLTE3

app/Http/Middleware/Authenticate.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Illuminate\Auth\Middleware\Authenticate as Middleware;
+
+class Authenticate extends Middleware
+{
+    /**
+     * Get the path the user should be redirected to when they are not authenticated.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return string
+     */
+    protected function redirectTo($request)
+    {
+        if (! $request->expectsJson()) {
+            return route('login');
+        }
+    }
+}