Title: Server Error: Cannot Access Offset of Type String on String in common.php Last modified: January 29, 2025 --- # Server Error: Cannot Access Offset of Type String on String in common.php * Resolved [guess4me](https://wordpress.org/support/users/guess4me/) * (@guess4me) * [1 year, 4 months ago](https://wordpress.org/support/topic/server-error-cannot-access-offset-of-type-string-on-string-in-common-php/) * Hello Support Team, * I am experiencing an issue with plugin and have started receiving the following error messages in `debug.log`: * `Request URI: /wp-admin/admin-ajax.php?action=wp_ewwwio_scan_async&nonce=4ff63042ce& lock_key PHP Fatal error: Uncaught TypeError: Cannot access offset of type string on string in /wp-content/plugins/ewww-image-optimizer/common.php:8416 Stack trace:# 0 /wp-content/plugins/ewww-image-optimizer/bulk.php(1185): ewww_image_optimizer_remove_duplicate_records()# 1 /wp-content/plugins/ewww-image-optimizer/aux-optimize.php(1625): ewww_image_optimizer_optimized_list()# 2 /wp-content/plugins/ewww-image-optimizer/aux-optimize.php(1874): ewww_image_optimizer_image_scan()# 3 /wp-content/plugins/ewww-image-optimizer/classes/class-async-scan.php(39): ewww_image_optimizer_aux_images_script()#4 /wp-content/plugins/ewww-image-optimizer/ classes/class-async-request.php(157): EWWW\Async_Scan->handle()#5 /wp-includes/ class-wp-hook.php(324): EWWW\Async_Request->maybe_handle()#6 /wp-includes/class- wp-hook.php(348): WP_Hook->apply_filters()#7 /wp-includes/plugin.php(517): WP_Hook- >do_action()#8 /wp-admin/admin-ajax.php(207): do_action()#9 {main}thrown in / wp-content/plugins/ewww-image-optimizer/common.php on line 8416 * Upon further investigation using xdebug, I noticed `$duplicate` variable does not contain an `'id'` field, which seems to be causing the error. Screenshot with xdebug data: [https://prnt.sc/pOo26h2fknQj](https://prnt.sc/pOo26h2fknQj) - This topic was modified 1 year, 4 months ago by [guess4me](https://wordpress.org/support/users/guess4me/). - This topic was modified 1 year, 4 months ago by [guess4me](https://wordpress.org/support/users/guess4me/). Viewing 5 replies - 1 through 5 (of 5 total) * Thread Starter [guess4me](https://wordpress.org/support/users/guess4me/) * (@guess4me) * [1 year, 4 months ago](https://wordpress.org/support/topic/server-error-cannot-access-offset-of-type-string-on-string-in-common-php/#post-18275201) * I’ve attached screenshot with additional info (previous step in stacktrace): [https://prnt.sc/FXwYiptXECKO](https://prnt.sc/FXwYiptXECKO). `www_image_optimizer_remove_duplicate_records` expects arrays with `'id'` field but plain id list is passed to the function. - This reply was modified 1 year, 4 months ago by [guess4me](https://wordpress.org/support/users/guess4me/). * Plugin Support [adamewww](https://wordpress.org/support/users/adamewww/) * (@adamewww) * [1 year, 4 months ago](https://wordpress.org/support/topic/server-error-cannot-access-offset-of-type-string-on-string-in-common-php/#post-18275632) * Hi [@guess4me](https://wordpress.org/support/users/guess4me/) * We greatly appreciate the detailed information. We’re currently looking into it as we had just made a fix to this specific section only a couple months back. Can you verify you are using the latest version of the plugin? * Thread Starter [guess4me](https://wordpress.org/support/users/guess4me/) * (@guess4me) * [1 year, 4 months ago](https://wordpress.org/support/topic/server-error-cannot-access-offset-of-type-string-on-string-in-common-php/#post-18275893) * [@adamewww](https://wordpress.org/support/users/adamewww/) Thank you, I’ve checked– I use 8.0.0 version. Can you send me example of code changes atleast in the screenshot if there any? * Plugin Support [adamewww](https://wordpress.org/support/users/adamewww/) * (@adamewww) * [1 year, 4 months ago](https://wordpress.org/support/topic/server-error-cannot-access-offset-of-type-string-on-string-in-common-php/#post-18277647) * Got it, thanks for checking and for all the info! * We had a look at it and updated it so that $duplicate[id] isn’t checked, as it shouldn’t be, but instead just $duplicate as well as putting in a better check to make sure we’re dealing with arrays. You can get the updated version here or wait for the next release: [https://docs.ewww.io/article/73-update-from-github](https://docs.ewww.io/article/73-update-from-github) * Plugin Support [adamewww](https://wordpress.org/support/users/adamewww/) * (@adamewww) * [1 year, 2 months ago](https://wordpress.org/support/topic/server-error-cannot-access-offset-of-type-string-on-string-in-common-php/#post-18370911) * I haven’t heard anything back about this in a while so I’m going to resolve this thread. If you have further questions, please feel free to open a new one! Viewing 5 replies - 1 through 5 (of 5 total) The topic ‘Server Error: Cannot Access Offset of Type String on String in common. php’ is closed to new replies. * ![](https://ps.w.org/ewww-image-optimizer/assets/icon-256x256.png?rev=1582276) * [EWWW Image Optimizer](https://wordpress.org/plugins/ewww-image-optimizer/) * [Frequently Asked Questions](https://wordpress.org/plugins/ewww-image-optimizer/#faq) * [Support Threads](https://wordpress.org/support/plugin/ewww-image-optimizer/) * [Active Topics](https://wordpress.org/support/plugin/ewww-image-optimizer/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/ewww-image-optimizer/unresolved/) * [Reviews](https://wordpress.org/support/plugin/ewww-image-optimizer/reviews/) * 5 replies * 2 participants * Last reply from: [adamewww](https://wordpress.org/support/users/adamewww/) * Last activity: [1 year, 2 months ago](https://wordpress.org/support/topic/server-error-cannot-access-offset-of-type-string-on-string-in-common-php/#post-18370911) * Status: resolved