diff --git a/app/Exceptions/Handler.php b/app/Exceptions/Handler.php
index 54df4167eab3..bdaf103dd36e 100644
--- a/app/Exceptions/Handler.php
+++ b/app/Exceptions/Handler.php
@@ -2,7 +2,6 @@
 
 namespace App\Exceptions;
 
-use Crawler;
 use Exception;
 use Illuminate\Auth\AuthenticationException;
 use Illuminate\Auth\Access\AuthorizationException;
@@ -51,11 +50,12 @@ class Handler extends ExceptionHandler
             return false;
         }
 
-        if (! class_exists('Utils')) {
+        // if these classes don't exist the install is broken, maybe due to permissions
+        if (! class_exists('Utils') || ! class_exists('Crawler')) {
             return parent::report($e);
         }
 
-        if (Crawler::isCrawler()) {
+        if (\Crawler::isCrawler()) {
             return false;
         }
 
diff --git a/docs/install.rst b/docs/install.rst
index 628a30fcf285..44a56c35136f 100644
--- a/docs/install.rst
+++ b/docs/install.rst
@@ -91,4 +91,4 @@ Troubleshooting
 - Running ``composer install`` and ``composer dump-autoload`` can sometimes help with composer problems.
 - If you’re using a subdomain. ie, invoice.mycompany.com You will need to add ``RewriteBase /`` to public/.htaccess otherwise it may fail with ``Request exceeded the limit of 10 internal redirects due to probable configuration error.`` messages in the logs.
 - Composer install error: ``Fatal error: Allowed memory size of...`` Try the following: ``php -d memory_limit=-1 /usr/local/bin/composer install``
-- PHP Fatal error: ``Call to undefined method Illuminate\Support\Facades\Session::get()`` try deleting bootstrap/cache/services.php
+- PHP Fatal error: ``Call to undefined method Illuminate\Support\Facades\Session::get()`` try deleting bootstrap/cache/services.php. If the file doesn't exist the steps `https://stackoverflow.com/a/37266353/497368 <here>`_ may help.