I enabled WP debug constant and now seeing loads of error notices for undefined index in controls-stack.php

[WebsiteDons]

Using E-3.6.5

Notice:  Undefined index: tab in /home/devzone/public_html/wp-content/plugins/elementor/includes/base/controls-stack.php on line 1537

The core source code

public function end_controls_section() {
		$stack_name = $this->get_name();

		// Save the current section for the action.
		$current_section = $this->current_section;
		$section_id = $current_section['section'];
		$args = [
			'tab' => $current_section['tab'],
		];
}

I can't trace the source which would be causing the issue in any plugin related to Elementor

• premium addons
• Elementor Header & Footer Builder

I've used a condition to rid the notices, but had to edit the core file

$args = [
	'tab' => (isset($current_section['tab']) ? $current_section['tab']:''),
];

Is this a known issue?