Title: Warning: Undefined array key 0 Last modified: January 16, 2024 --- # Warning: Undefined array key 0 * Resolved [pb7555](https://wordpress.org/support/users/pb7555/) * (@pb7555) * [2 years, 4 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-0/) * Plugin is giving this error message on category pages only; all other pages are okay. thanks. * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fwarning-undefined-array-key-0%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 8 replies - 1 through 8 (of 8 total) * Thread Starter [pb7555](https://wordpress.org/support/users/pb7555/) * (@pb7555) * [2 years, 4 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-0/#post-17348209) * Warning: Undefined array key 0 in /home/readingr/public_html/wp-content/plugins/ responsive-menu/v4.0.0/inc/classes/class-option-manager.php on line 60 * [sumitsanadhya](https://wordpress.org/support/users/sumitsanadhya/) * (@sumitsanadhya) * [2 years, 4 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-0/#post-17350541) * Dear [@pb7555](https://wordpress.org/support/users/pb7555/), * I hope this message finds you well. * Thank you for reaching out to us. I appreciate your inquiry and will promptly discuss the matter with our technical team. Rest assured, I will keep you informed of any further updates. * If you have any additional questions or concerns in the meantime, please feel free to let me know. * Best regards, Sumit * [sumitsanadhya](https://wordpress.org/support/users/sumitsanadhya/) * (@sumitsanadhya) * [2 years, 4 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-0/#post-17379723) * Dear [@pb7555](https://wordpress.org/support/users/pb7555/), * I trust this message finds you well. * We have implemented a small code change in our file v4.0.0/inc/classes/class- option-manager.php at lines 59 and 60. For your reference, you can view the code changes [https://github.com/ResponsiveMenu/Responsive-Menu/pull/253/files](https://github.com/ResponsiveMenu/Responsive-Menu/pull/253/files) * Kindly apply the same changes and let us know if the issue has been resolved on your end. * Looking forward to your reply. * Regards, Sumit * Thread Starter [pb7555](https://wordpress.org/support/users/pb7555/) * (@pb7555) * [2 years, 4 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-0/#post-17403385) * Hi, thanks for your reply. Implementing the code change in v4.0.0/inc/classes/ class-option-manager.php at lines 59 and 60 resulted in another error so I reverted back. * Fatal error: Uncaught TypeError: Cannot access offset of type string on string in /home/readingr/public_html/wp-content/plugins/responsive-menu/v4.0.0/inc/classes/ class-option-manager.php:60 Stack trace: #0 /home/readingr/public_html/wp-content/ plugins/responsive-menu/v4.0.0/inc/classes/class-style-manager.php(195): RMP\ Features\Inc\Option_Manager->get_options(2392) #1 /home/readingr/public_html/ wp-content/plugins/responsive-menu/v4.0.0/inc/classes/class-style-manager.php( 274): RMP\Features\Inc\Style_Manager->get_all_menu_options() #2 /home/readingr/ public_html/wp-includes/class-wp-hook.php(324): RMP\Features\Inc\Style_Manager- >add_rmp_menu_frontend_scripts(”) #3 /home/readingr/public_html/wp-includes/class- wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #4 /home/readingr/public_html/ wp-includes/plugin.php(517): WP_Hook->do_action(Array) #5 /home/readingr/public_html/ wp-includes/script-loader.php(2262): do_action(‘wp_enqueue_scri…’) #6 /home/readingr/ public_html/wp-includes/class-wp-hook.php(324): wp_enqueue_scripts(”) #7 /home/ readingr/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(”, Array) #8 /home/readingr/public_html/wp-includes/plugin.php(517): WP_Hook->do_action( Array) #9 /home/readingr/public_html/wp-includes/general-template.php(3052): do_action(‘wp_head’) #10 /home/readingr/public_html/wp-content/themes/rebus/header. php(31): wp_head() #11 /home/readingr/public_html/wp-includes/template.php(790): require_once(‘/home/readingr/…’) #12 /home/readingr/public_html/wp-includes/template. php(725): load_template(‘/home/readingr/…’, true, Array) #13 /home/readingr/public_html/ wp-includes/general-template.php(48): locate_template(Array, true, true, Array)# 14 /home/readingr/public_html/wp-content/themes/rebus/category.php(10): get_header()# 15 /home/readingr/public_html/wp-includes/template-loader.php(106): include(‘/ home/readingr/…’) #16 /home/readingr/public_html/wp-blog-header.php(19): require_once(‘/ home/readingr/…’) #17 /home/readingr/public_html/index.php(17): require(‘/home/ readingr/…’) #18 {main} thrown in /home/readingr/public_html/wp-content/plugins/ responsive-menu/v4.0.0/inc/classes/class-option-manager.php on line 60 * [sumitsanadhya](https://wordpress.org/support/users/sumitsanadhya/) * (@sumitsanadhya) * [2 years, 4 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-0/#post-17404901) * Hello [@pb7555](https://wordpress.org/support/users/pb7555/), * Thank you for your input. * I will discuss this matter with our technical team and provide you with further updates shortly. * If you have any additional questions or concerns, please feel free to let me know. * Regards, Sumit * [sumitsanadhya](https://wordpress.org/support/users/sumitsanadhya/) * (@sumitsanadhya) * [2 years, 4 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-0/#post-17409216) * Hello [@pb7555](https://wordpress.org/support/users/pb7555/), * Can you please add this code at line 60 * $options = is_array( $options ) ? $options : array(); * PR URL: [https://github.com/ResponsiveMenu/Responsive-Menu/pull/254](https://github.com/ResponsiveMenu/Responsive-Menu/pull/254) * Let me know if you need more help. * Regards, Sumit * Thread Starter [pb7555](https://wordpress.org/support/users/pb7555/) * (@pb7555) * [2 years, 4 months ago](https://wordpress.org/support/topic/warning-undefined-array-key-0/#post-17409632) * Thank you, that worked. Except now the responsive menu does not appear on category pages: [https://readingrebus.com/category/advertisements/](https://readingrebus.com/category/advertisements/) * [Prakash](https://wordpress.org/support/users/prakashnfrn/) * (@prakashnfrn) * [2 years, 1 month ago](https://wordpress.org/support/topic/warning-undefined-array-key-0/#post-17713067) * Hi, * As per your coding update on the class-option-manager.php, I have updated but still the category page not working, I am getting 500 internal server error. If I deactivate the responsive menu pro plugin, the category page working fine. * Error log: **Notice**: Uninitialized string offset: 0 in **/home/customer/www/ ourdomain.com/public_html/wp-content/plugins/responsive-menu-pro/v4.0.0/inc/classes/ class-option-manager.php** on line **60** * Thanks - This reply was modified 2 years, 1 month ago by [Prakash](https://wordpress.org/support/users/prakashnfrn/). Viewing 8 replies - 1 through 8 (of 8 total) The topic ‘Warning: Undefined array key 0’ is closed to new replies. * ![](https://ps.w.org/responsive-menu/assets/icon-256x256.png?rev=1782326) * [Responsive Menu - Create Mobile-Friendly Menu](https://wordpress.org/plugins/responsive-menu/) * [Frequently Asked Questions](https://wordpress.org/plugins/responsive-menu/#faq) * [Support Threads](https://wordpress.org/support/plugin/responsive-menu/) * [Active Topics](https://wordpress.org/support/plugin/responsive-menu/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/responsive-menu/unresolved/) * [Reviews](https://wordpress.org/support/plugin/responsive-menu/reviews/) * 8 replies * 3 participants * Last reply from: [Prakash](https://wordpress.org/support/users/prakashnfrn/) * Last activity: [2 years, 1 month ago](https://wordpress.org/support/topic/warning-undefined-array-key-0/#post-17713067) * Status: resolved