Title: Does it work with multi-site?
Last modified: August 21, 2016

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# Does it work with multi-site?

 *  Resolved [wn nj](https://wordpress.org/support/users/waseemnaikgmailcom/)
 * (@waseemnaikgmailcom)
 * [12 years, 3 months ago](https://wordpress.org/support/topic/does-it-work-with-multi-site/)
 * Hello,
 * It works with single installation with CDN turned on and under WP 3.8.1.
 * However, on my multisite, with CDN turned on, I get a fatal error message:
 * Fatal error: Class ‘QM_Backtrace’ not found in
    …/wp-content/plugins/wp-smushit/
   wp-smushit.php on line 102
 * I get the same error whether in the network or in the sub-site.
 * Kindly advise.
 * [https://wordpress.org/plugins/wp-smushit/](https://wordpress.org/plugins/wp-smushit/)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [David](https://wordpress.org/support/users/ugotsta/)
 * (@ugotsta)
 * [12 years, 3 months ago](https://wordpress.org/support/topic/does-it-work-with-multi-site/#post-4588309)
 * Hi [@wn](https://wordpress.org/support/users/wn/) nj,
 * Hope you’re well today! 🙂
 * Yes, the plugin works with Multisite. Have you tried without the CDN to see how
   it works with that? Not sure if that can simply be disabled for testing but hoping
   so.
 * Also, could we get details on your site? Which CDN for example? Are the images
   themselves stored locally on your server?
 * Looking forward to getting that sorted.
 * Cheers,
    David
 *  Plugin Author [WPMU DEV – Your All-in-One WordPress Platform](https://wordpress.org/support/users/wpmudev/)
 * (@wpmudev)
 * [12 years, 2 months ago](https://wordpress.org/support/topic/does-it-work-with-multi-site/#post-4588438)
 * Hey there.
 * We haven’t heard from you in awhile, so I just wanted to check in to make sure
   all was good.
 * This thread was marked resolved, but please, if you still need help then just
   respond and open it back up. We can then take it from there. 🙂
 * Hope you have a fantastic day!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Does it work with multi-site?’ is closed to new replies.

 * ![](https://ps.w.org/wp-smushit/assets/icon-256x256.gif?rev=3447113)
 * [Smush – Image Optimization, Compression, Lazy Load, WebP & CDN](https://wordpress.org/plugins/wp-smushit/)
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## Tags

 * [cdn](https://wordpress.org/support/topic-tag/cdn/)
 * [multi-site](https://wordpress.org/support/topic-tag/multi-site/)

 * 2 replies
 * 3 participants
 * Last reply from: [WPMU DEV – Your All-in-One WordPress Platform](https://wordpress.org/support/users/wpmudev/)
 * Last activity: [12 years, 2 months ago](https://wordpress.org/support/topic/does-it-work-with-multi-site/#post-4588438)
 * Status: resolved