Xmy8GhCWhA

Due to above error, I have deinstalled plugin yesterday and was surprised to read about very quick fix. Now I have installed wp-user-avatar again and test is fine. Error message did not appear again. Thanks a lot!

I get the same error: WP User Avatar error: array_key_exists() expects parameter 2 to be array

Warning: array_key_exists() expects parameter 2 to be array, 
string given in 
/home/www/subdomain.domain.come/wp-content/plugins/wp-user-avatar/includes
/class-wp-user-avatar-functions.php on line 140

Fatal error: Uncaught Error: Cannot use string offset as an array in 
/home/www/subdomain.domain.come/wp-content/plugins/wp-user-avatar
/includes/class-wp-user-avatar-functions.php:150 
Stack trace: #0 /home/www/subdomain.domain.come/wp-content/plugins
/wp-user-avatar/includes/class-wp-user-avatar-functions.php(356):
WP_User_Avatar_Functions->wpua_has_gravatar(1) 
#1 /home/www/subdomain.domain.come/wp-includes/class-wp-hook.php(288): 
WP_User_Avatar_Functions->wpua_get_avatar_filter
('<img alt='' src...', 1, 64, 'wp_user_avatar', 'Avatar') #2 
/home/www/subdomain.domain.come/wp-includes/plugin.php(208): 
WP_Hook->apply_filters('<img alt='' src...', Array) 
#3 /home/www/subdomain.domain.come/wp-includes/pluggable.php(2658):   
apply_filters('get_avatar', 
'<img alt='' src...', 1, 64, 'wp_user_avatar', '', Array) 
#4 /home/www/subdomain.domain.come/wp-includes/admin-bar.php 
(279): get_avatar(1, 64) 
#5 /home/www/subdomain.domain.come/wp-includes/class-wp-hook.php(286): 
wp_admin_bar_my_account_menu(Object(WP_Admi in 
/home/www/subdomain.domain.come/wp-content/plugins/wp-user-avatar
/includes/class-wp-user-avatar-functions.php on line 150

I never had a plugin with this kind of behaviour. The only to get back control over WordPress is to start FileZilla and to rename path wp-content/plugins/wp-user-avatar to different name.

@rcharbonxx: Thanks for your solution! I confirm that disabling “Include sitemap in HTML format” resolved the problem.