Uncaught TypeError: Cannot access offset of type string on string

I support an Elementor site that WordPress’s built-in detection system says has thrown an error. Apparently, the error isn’t fatal and the site still works, but I’d like to know whether the issue that causes it is known and being fixed. Especially because the alert system will be continually emailing administrators until it the error is corrected. The error I got was:

Error Details
=============
An error of type E_ERROR was caused in line 1274 of the file /code/wp-content/plugins/elementor/includes/base/controls-stack.php. Error message: Uncaught TypeError: Cannot access offset of type string on string in /code/wp-content/plugins/elementor/includes/base/controls-stack.php:1274
Stack trace:
#0 /code/wp-content/plugins/ele-custom-skin/includes/dynamic-style.php(72): Elementor\Controls_Stack->parse_dynamic_settings(Array, Array)
#1 /code/wp-includes/class-wp-hook.php(310): ECS_set_dynamic_style(Object(Elementor\Widget_Progress))
#2 /code/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(NULL, Array)
#3 /code/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#4 /code/wp-content/plugins/elementor/includes/base/element-base.php(455): do_action(‘elementor/front…’, Object(Elementor\Widget_Progress))
#5 /code/wp-content/plugins/elementor/includes/base/element-base.php(1375): Elementor\Element_Base->print_element()
#6 /code/wp-content/plugins/elementor/includes/base/element-base.php(464): Elementor\Element_Base->print_content()
#7 /code/wp-content/plugins/elementor/includes/base/element-base.php(1375): Elementor\Element_Base->print_element()
#8 /code/wp-content/plugins/elementor/includes/base/element-base.php(464): Elementor\Element_Base->print_content()
#9 /code/wp-content/plugins/elementor/core/base/document.php(1739): Elementor\Element_Base->print_element()
#10 /code/wp-content/plugins/elementor-pro/modules/theme-builder/documents/theme-document.php(418): Elementor\Core\Base\Document->print_elements(Array)
#11 /code/wp-content/plugins/elementor/includes/frontend.php(1179): ElementorPro\Modules\ThemeBuilder\Documents\Theme_Document->print_elements_with_wrapper(Array)
#12 /code/wp-content/plugins/elementor/includes/frontend.php(1247): Elementor\Frontend->get_builder_content(‘1743’, true)
#13 /code/wp-content/plugins/ele-custom-skin/skins/skin-custom.php(273): Elementor\Frontend->get_builder_content_for_display(‘1743’)
#14 /code/wp-content/plugins/ele-custom-skin/skins/skin-custom.php(323): ElementorPro\Modules\Posts\Skins\Skin_Posts_ECS->get_template()
#15 /code/wp-content/plugins/ele-custom-skin/skins/skin-custom.php(567): ElementorPro\Modules\Posts\Skins\Skin_Posts_ECS->render_post()
#16 /code/wp-content/plugins/elementor/includes/base/skin-base.php(79): ElementorPro\Modules\Posts\Skins\Skin_Posts_ECS->render()
#17 /code/wp-content/plugins/elementor/includes/base/widget-base.php(607): Elementor\Skin_Base->render_by_mode()
#18 /code/wp-content/plugins/elementor/includes/base/widget-base.php(733): Elementor\Widget_Base->render_content()
#19 /code/wp-content/plugins/elementor/includes/base/element-base.php(551): Elementor\Widget_Base->get_raw_data(true)
#20 /code/wp-content/plugins/elementor/includes/base/element-base.php(551): Elementor\Element_Base->get_raw_data(true)
#21 /code/wp-content/plugins/elementor/includes/base/element-base.php(551): Elementor\Element_Base->get_raw_data(true)
#22 /code/wp-content/plugins/elementor/includes/base/element-base.php(551): Elementor\Element_Base->get_raw_data(true)
#23 /code/wp-content/plugins/elementor/core/base/document.php(1013): Elementor\Element_Base->get_raw_data(true)
#24 /code/wp-content/plugins/elementor/core/base/document.php(679): Elementor\Core\Base\Document->get_elements_raw_data(Array, true)
#25 /code/wp-content/plugins/elementor/includes/base/controls-stack.php(1010): Elementor\Core\Base\Document->get_initial_config()
#26 /code/wp-content/plugins/elementor/core/editor/loader/common/editor-common-scripts-settings.php(34): Elementor\Controls_Stack->get_config()
#27 /code/wp-content/plugins/elementor/core/editor/loader/v1/editor-v1-loader.php(76): Elementor\Core\Editor\Loader\Common\Editor_Common_Scripts_Settings::get()
#28 /code/wp-content/plugins/elementor/core/editor/editor.php(358): Elementor\Core\Editor\Loader\V1\Editor_V1_Loader->enqueue_scripts()
#29 /code/wp-includes/class-wp-hook.php(310): Elementor\Core\Editor\Editor->enqueue_scripts(”)
#30 /code/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(”, Array)
#31 /code/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#32 /code/wp-includes/script-loader.php(2225): do_action(‘wp_enqueue_scri…’)
#33 /code/wp-includes/class-wp-hook.php(310): wp_enqueue_scripts(”)
#34 /code/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(”, Array)
#35 /code/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#36 /code/wp-includes/general-template.php(3053): do_action(‘wp_head’)
#37 /code/wp-content/plugins/elementor/includes/editor-templates/editor-wrapper.php(31): wp_head()
#38 /code/wp-content/plugins/elementor/core/editor/loader/v1/editor-v1-loader.php(110): include(‘/code/wp-conten…’)
#39 /code/wp-content/plugins/elementor/core/editor/editor.php(163): Elementor\Core\Editor\Loader\V1\Editor_V1_Loader->print_root_template()
#40 /code/wp-includes/class-wp-hook.php(310): Elementor\Core\Editor\Editor->init(”)
#41 /code/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(”, Array)
#42 /code/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#43 /code/wp-admin/admin.php(419): do_action(‘admin_action_el…’)
#44 /code/wp-admin/post.php(12): require_once(‘/code/wp-admin/…’)
#45 {main}
? thrown