Magento: “Fatal error: Uncaught exception” erorr when trying to access Magento Connect manager

That’s a known bug and is present in Magento since version 1.1.2 and still isn’t fixed. The solution is quite easy and takes less than 5 minutes :)

Simply edit the following file using cpanel’s file manager:

app/code/core/Mage/Core/Model/App.php

in it around line 558, you should find the following:

$id = $this->_currentStore;

which is the culprit. The solution is to chnage this line to:

$id = $this->_currentStore ? $this->_currentStore : “default”;

Save the file, clear the cache and sessions by deleting the contents of the following folders:

• /var/cache
• /var/sessions

and login anew :)