Fatal Error after installing plugin

I get the following error after installing, activating then setting up a field removing the Brands icon set.

Uncaught TypeError: json_decode(): Argument #1 ($json) must be of type string, array givenHelp me with this error

Plugin: Advanced Custom Fields: Font Awesome

File: /home/customer/www/thedivinesymmetry.com/public_html/wp-content/plugins/advanced-custom-fields-font-awesome/fields/acf-font-awesome-v7.php

Line: 241

Stack trace: #0 /wp-content/plugins/advanced-custom-fields-font-awesome/fields/acf-font-awesome-v7.php(241): json_decode(Array) #1 /wp-includes/class-wp-hook.php(341): acf_field_font_awesome->render_field(Array) #2 /wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(”, Array) #3 /wp-includes/plugin.php(570): WP_Hook->do_action(Array) #4 /wp-content/plugins/advanced-custom-fields-pro/includes/acf-hook-functions.php(122): do_action_ref_array(‘acf/render_fiel…’, Array) #5 /wp-includes/class-wp-hook.php(341): _acf_apply_hook_variations(Array) #6 /wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(”, Array) #7 /wp-includes/plugin.php(522): WP_Hook->do_action(Array) #8 /wp-content/plugins/advanced-custom-fields-pro/includes/acf-field-functions.php(816): do_action(‘acf/render_fiel…’, Array) #9 /wp-content/plugins/advanced-custom-fields-pro/includes/acf-field-functions.php(772): acf_render_field(Array) #10 /wp-content/plugins/advanced-custom-fields-pro/includes/acf-field-functions.php(623): acf_render_field_wrap(Array, ‘div’, ‘label’) #11 /wp-content/plugins/advanced-custom-fields-pro/includes/forms/form-post.php(237): acf_render_fields(Array, 1917, ‘div’, ‘label’) #12 /wp-admin/includes/template.php(1453): ACF_Form_Post->render_meta_box(Object(WP_Post), Array) #13 /wp-admin/edit-form-advanced.php(721): do_meta_boxes(Object(WP_Screen), ‘normal’, Object(WP_Post)) #14 /wp-admin/post.php(206): require(‘/home/customer/…’) #15 {main} thrown in /wp-content/plugins/advanced-custom-fields-font-awesome/fields/acf-font-awesome-v7.php on line 241