Undefined array key “key” in class-svg-shapes.php on line 515

I am getting multiple PHP warnings in my error logs:

PHP Warning: Undefined array key "key" in /home/gyghgfduser/public_html/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/class-svg-shapes.php on line 515

I have this in my functions.php which may or may not be related:

function custom_avf_custom_svg_shapes( array $custom_shapes ) {
// example for uploading a svg file:  your_file.svg 
$custom_shapes = array (
	'grad-triangle'	=> array(
		'title'			=> __('Gradient triangle', 'avia_framework' ), // Name displayed in select box - whatever you like 
		'has_negative'	=> false,				// uploaded file had to be named: your_file-negative.svg
		'has_flip'		=> true,
		'has_width'		=> true,
		//'path'			=> string,				// if you like to determine a different path (absolute)
		'filename'		=> 'grad-triangle'			// .svg will be added if missing
		//'attachment'			=> integer,				// attachment id of uploaded media ( if you like to determine )
		//'attachment_negative'	=> integer 				// attachment id of negative uploaded media ( if you like to determine )
	),
	'hp-banner-divider'	=> array(
		'title'			=> __('Homepage divider', 'avia_framework' ), // Name displayed in select box - whatever you like 
		'has_negative'	=> false,				// uploaded file had to be named: your_file-negative.svg
		'has_flip'		=> false,
		'has_width'		=> false,
		//'path'			=> string,				// if you like to determine a different path (absolute)
		'filename'		=> 'hp-banner-divider'			// .svg will be added if missing
		//'attachment'			=> integer,				// attachment id of uploaded media ( if you like to determine )
		//'attachment_negative'	=> integer 				// attachment id of negative uploaded media ( if you like to determine )
	),
	'hp-banner-divider-no-wedge'	=> array(
		'title'			=> __('Homepage divider (no wedge)', 'avia_framework' ), // Name displayed in select box - whatever you like 
		'has_negative'	=> false,				// uploaded file had to be named: your_file-negative.svg
		'has_flip'		=> false,
		'has_width'		=> false,
		//'path'			=> string,				// if you like to determine a different path (absolute)
		'filename'		=> 'hp-banner-divider-no-wedge'			// .svg will be added if missing
		//'attachment'			=> integer,				// attachment id of uploaded media ( if you like to determine )
		//'attachment_negative'	=> integer 				// attachment id of negative uploaded media ( if you like to determine )
	),
);
return $custom_shapes;
}
add_filter( 'avf_custom_svg_shapes', 'custom_avf_custom_svg_shapes', 10, 1 );

Are the PHP Warnings likely to be because of something I have done or a missing key check in Enfold?

Thanks