Undefined array key 0

Hello,

Running Query Monitor and giving me a Warning.

Undefined array key 0
Count 7
Plugin: simple-local-avatars
LOCATION:

wp-includes/meta.php:573
get_metadata_raw()
wp-includes/meta.php:509
get_metadata()
wp-includes/user.php:1023
get_user_meta()
wp-content/plugins/simple-local-avatars/includes/class-simple-local-avatars.php:120
Simple_Local_Avatars->get_simple_local_avatar_url()
wp-content/plugins/simple-local-avatars/includes/class-simple-local-avatars.php:78
Simple_Local_Avatars->get_avatar_data()
wp-includes/class-wp-hook.php:303
apply_filters('pre_get_avatar_data')
wp-includes/link-template.php:4300
get_avatar_data()
wp-includes/link-template.php:4160
get_avatar_url()
wp-content/plugins/wordpress-seo/src/generators/schema/person.php:223
Yoast\W\S\G\S\Person->set_image_from_avatar()
wp-content/plugins/wordpress-seo/src/generators/schema/person.php:178
Yoast\W\S\G\S\Person->add_image()
wp-content/plugins/wordpress-seo/src/generators/schema/person.php:146
Yoast\W\S\G\S\Person->build_person_data()
wp-content/plugins/wordpress-seo/src/generators/schema/author.php:44
Yoast\W\S\G\S\Author->generate()
wp-content/plugins/wordpress-seo/src/generators/schema-generator.php:128
Yoast\W\S\G\Schema_Generator->generate_graph()
wp-content/plugins/wordpress-seo/src/generators/schema-generator.php:76
Yoast\W\S\G\Schema_Generator->generate()
wp-content/plugins/wordpress-seo/src/presentations/indexable-presentation.php:738
Yoast\W\S\P\Indexable_Presentation->generate_schema()
wp-content/plugins/wordpress-seo/src/presentations/abstract-presentation.php:64
Yoast\W\S\P\Abstract_Presentation->__get()
wp-content/plugins/wordpress-seo/src/presenters/schema-presenter.php:60
Yoast\W\S\P\Schema_Presenter->get()
wp-content/plugins/wordpress-seo/src/presenters/schema-presenter.php:44
Yoast\W\S\P\Schema_Presenter->present()
wp-content/plugins/wordpress-seo/src/integrations/front-end-integration.php:317
Yoast\W\S\I\Front_End_Integration->present_head()
wp-includes/class-wp-hook.php:303
do_action('wpseo_head')
wp-content/plugins/wordpress-seo/src/integrations/front-end-integration.php:291
Yoast\W\S\I\Front_End_Integration->call_wpseo_head()
wp-includes/class-wp-hook.php:303
do_action('wp_head')
wp-includes/general-template.php:3015
wp_head()
wp-content/themes/jnews-child/header.php:12
load_template('wp-content/themes/jnews-child/header.php')
wp-includes/template.php:716
locate_template()
wp-includes/general-template.php:48
get_header()
wp-content/themes/jnews/single.php:5