Ticket #19222: fix-user-set-role-with-non-zero-index.diff

wp-includes/capabilities.php

@@ -721 +721 @@
                 foreach ( (array) $this->roles as $oldrole )
                         unset( $this->caps[$oldrole] );
 
-                if ( 1 == count( $this->roles ) && $role == $this->roles[0] )
+                if ( 1 == count( $this->roles ) && $role == current($this->roles) )
                         return;
 
                 if ( !empty( $role ) ) {