Version 2.9 array-merge error

[Romain]

Hello, since the update to version 2.9, the following error message appears above the footer of all my site.

Please help me find the problem


Warning: array_merge(): Expected parameter 1 to be an array, null given in /home/uxndesig/public_html/tourdeleure/wp-content/plugins/elementor/includes/base/controls-stack.php on line 1184