Title: Throwing Error – Warning : Undefined array key “inner_tab”
Last modified: May 7, 2026

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# Throwing Error – Warning : Undefined array key “inner_tab”

 *  [clickbaithysteria](https://wordpress.org/support/users/clickbaithysteria/)
 * (@clickbaithysteria)
 * [6 days ago](https://wordpress.org/support/topic/throwing-error-warning-undefined-array-key-inner_tab/)
 * The most recent set of updates has caused Elementor to start throwing the error“
   Warning : Undefined array key “inner_tab” in wp-content/plugins/elementor/includes/
   base/controls-stack.php on line 672″
 * I have deactivated all plugins except Elementor and started turning them on one
   by one, the error doesn’t return until I activate ele-custom-skin.
 * I’ve tried self-solving this issue however searching the error only returns 29
   pages of Google results with sites that have the very same error: [https://www.google.com/search?q=ele-custom-skin+Warning+:+Undefined+array+key+%22inner_tab%22+in+wp-content/plugins/elementor/includes/base/controls-stack.php+on+line+672&newwindow=1&sca_esv=bc87673d3ad1280f&rlz=1C5CHFA_enUS961US961&sxsrf=ANbL-n7P82xXne6BoPh07HA1ItMC5BDLGA:1778179487908&ei=n938aeyNN73D0PEPl6CViQI&start=0&sa=N&sstk=Af77f_fnn-9WyzlkjC3F2NWm3GsBhQKiopHfEoff5EkMZsMwe_WJkEK1Hr4JpAtwMIBQeBSI2Zp9ZZcyLGZzzCgwPcPv26nRco1T-pYM1aUM9OuTP9kT5IaIgTWJ3ALEB7jYnQ515lYCjHBTB8sdAugH8SCe2MfWPiA9bbxyuDOKBGeKO3OJGVgeY9CxKeUPZHTH-sCZhFP4FRJ-lF16ela6aM0AQwrX9rQVbDJzWWjGLvBV6Xm_nGmAnLJclWuI9mfjwR0abrrLLKqzncJ-QLhuMXVgW6-d2wtgPnWGv3fJphF1tdm8u1pfqd2IeeLT6WDqSS7-gKXSsVcGPkzt9wthqtWT2dCJmTiHsfbkorQS4miJARYOhQOLmiK6e3OraIkx-W7zShVebP5Y6dh3NtTYAPHcDxtxmNZ6Xz72KQZGFykqr0Zpwow&ved=2ahUKEwis2eTl6qeUAxW9ITQIHRdQJSE4KBDy0wN6BAgxEAQ&biw=1432&bih=958&dpr=1](https://www.google.com/search?q=ele-custom-skin+Warning+:+Undefined+array+key+%22inner_tab%22+in+wp-content/plugins/elementor/includes/base/controls-stack.php+on+line+672&newwindow=1&sca_esv=bc87673d3ad1280f&rlz=1C5CHFA_enUS961US961&sxsrf=ANbL-n7P82xXne6BoPh07HA1ItMC5BDLGA:1778179487908&ei=n938aeyNN73D0PEPl6CViQI&start=0&sa=N&sstk=Af77f_fnn-9WyzlkjC3F2NWm3GsBhQKiopHfEoff5EkMZsMwe_WJkEK1Hr4JpAtwMIBQeBSI2Zp9ZZcyLGZzzCgwPcPv26nRco1T-pYM1aUM9OuTP9kT5IaIgTWJ3ALEB7jYnQ515lYCjHBTB8sdAugH8SCe2MfWPiA9bbxyuDOKBGeKO3OJGVgeY9CxKeUPZHTH-sCZhFP4FRJ-lF16ela6aM0AQwrX9rQVbDJzWWjGLvBV6Xm_nGmAnLJclWuI9mfjwR0abrrLLKqzncJ-QLhuMXVgW6-d2wtgPnWGv3fJphF1tdm8u1pfqd2IeeLT6WDqSS7-gKXSsVcGPkzt9wthqtWT2dCJmTiHsfbkorQS4miJARYOhQOLmiK6e3OraIkx-W7zShVebP5Y6dh3NtTYAPHcDxtxmNZ6Xz72KQZGFykqr0Zpwow&ved=2ahUKEwis2eTl6qeUAxW9ITQIHRdQJSE4KBDy0wN6BAgxEAQ&biw=1432&bih=958&dpr=1)

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Author [dudaster](https://wordpress.org/support/users/dudaster/)
 * (@dudaster)
 * [5 days, 14 hours ago](https://wordpress.org/support/topic/throwing-error-warning-undefined-array-key-inner_tab/#post-18902403)
 * Thanks for the report. To help us track this down, could you let us know:
 * 1. Which ECS modules do you have active (ECS in the WordPress admin > Modules)?
   
   2. Which version of Elementor (free) are you running?
 * This will help us identify which control registration is triggering the warning
   in controls-stack.php.
 *  Plugin Author [dudaster](https://wordpress.org/support/users/dudaster/)
 * (@dudaster)
 * [5 days, 13 hours ago](https://wordpress.org/support/topic/throwing-error-warning-undefined-array-key-inner_tab/#post-18902497)
 * Thanks for the report. This is fixed in ECS 4.1.10, now available on WordPress.
   org.
 * The warning was triggered when ECS registered responsive color controls on the
   nav menu widget using position anchors that point to tab-type controls. These
   controls have tabs_wrapper set but no inner_tab, so Elementor’s get_position_info()
   accessed an undefined key in PHP 8.x. The position anchors are now updated to
   reference controls that have both tabs_wrapper and inner_tab set.
 * Please update to 4.1.10 and let me know if the warning is gone.
 *  Thread Starter [clickbaithysteria](https://wordpress.org/support/users/clickbaithysteria/)
 * (@clickbaithysteria)
 * [1 day, 23 hours ago](https://wordpress.org/support/topic/throwing-error-warning-undefined-array-key-inner_tab/#post-18905117)
 * All is working as expected now. Thank you!

Viewing 3 replies - 1 through 3 (of 3 total)

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 * 3 replies
 * 2 participants
 * Last reply from: [clickbaithysteria](https://wordpress.org/support/users/clickbaithysteria/)
 * Last activity: [1 day, 23 hours ago](https://wordpress.org/support/topic/throwing-error-warning-undefined-array-key-inner_tab/#post-18905117)
 * Status: not resolved