error php Undefined property: ECF_FontData

hello

i have this errors after plugin active.
can you help me?
thanks !

[Mon Jul 04 19:02:17.491016 2022] [proxy_fcgi:error] [pid 23977:tid 140392644081408]  AH01071: Got error 'PHP message: PHP Warning:  Undefined property: ECF_FontData::$font_families in /wp-content/plugins/elegant-custom-fonts/elegant-custom-fonts.php on line 223PHP message: PHP Fatal error:  Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in //wp-content/plugins/elegant-custom-fonts/elegant-custom-fonts.php:223\nStack trace:\n#0 //wp-includes/class-wp-hook.php(307): ECF_Plugin->admin_page()\n#1 //wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()\n#2 //wp-includes/plugin.php(476): WP_Hook->do_action()\n#3 //wp-admin/admin.php(259): do_action()\n#4 //wp-admin/options-general.php(10): require_once('...')\n#5 {main}\n  thrown in //wp-content/plugins/elegant-custom-fonts/elegant-custom-fonts.php on line 223', referer: /wp-admin/plugins.php?plugin_status=all&paged=1&s
[Mon Jul 04 19:02:41.007121 2022] [proxy_fcgi:error] [pid 23978:tid 140392845506304] AH01071: Got error 'PHP message: PHP Warning:  Undefined property: ECF_FontData::$font_families in //wp-content/plugins/elegant-custom-fonts/elegant-custom-fonts.php on line 223PHP message: PHP Fatal error:  Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in //wp-content/plugins/elegant-custom-fonts/elegant-custom-fonts.php:223\nStack trace:\n#0 //wp-includes/class-wp-hook.php(307): ECF_Plugin->admin_page()\n#1 //wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()\n#2 //wp-includes/plugin.php(476): WP_Hook->do_action()\n#3 //wp-admin/admin.php(259): do_action()\n#4 //wp-admin/options-general.php(10): require_once('...')\n#5 {main}\n  thrown in //wp-content/plugins/elegant-custom-fonts/elegant-custom-fonts.php on line 223', referer: /wp-admin/options-general.php?page=Elegant_Custom_Fonts
[Mon Jul 04 19:06:24.107728 2022] [proxy_fcgi:error] [pid 23978:tid 140392660866816] AH01071: Got error 'PHP message: PHP Warning:  Undefined property: ECF_FontData::$font_families in //wp-content/plugins/elegant-custom-fonts/elegant-custom-fonts.php on line 223PHP message: PHP Fatal error:  Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in //wp-content/plugins/elegant-custom-fonts/elegant-custom-fonts.php:223\nStack trace:\n#0 //wp-includes/class-wp-hook.php(307): ECF_Plugin->admin_page()\n#1 //wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()\n#2 //wp-includes/plugin.php(476): WP_Hook->do_action()\n#3 //wp-admin/admin.php(259): do_action()\n#4 //wp-admin/options-general.php(10): require_once('...')\n#5 {main}\n  thrown in //wp-content/plugins/elegant-custom-fonts/elegant-custom-fonts.php on line 223', referer: /wp-admin/plugins.php?plugin_status=all&paged=1&s