“从技术上讲”，这只是一个PHP警告而不是错误，您不应该在生产服务器上启用警告。您可以禁用PHP记录警告，它仍然会将错误记录到错误日志文件中。

您可以通过在自定义PHP中设置PHP警告来禁用它。服务器上的ini文件（除警告外的所有错误）：error_reporting = E_ALL & ~E_WARNING

或者尝试使用PHP进行设置：

error_reporting(E_ALL & ~E_WARNING);

; Common Values:
;   E_ALL (Show all errors, warnings and notices including coding standards.)
;   E_ALL & ~E_NOTICE  (Show all errors, except for notices)
;   E_ALL & ~E_NOTICE & ~E_STRICT  (Show all errors, except for notices and coding standards warnings.)
;   E_COMPILE_ERROR|E_RECOVERABLE_ERROR|E_ERROR|E_CORE_ERROR  (Show only errors)
; Default Value: E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED
; Development Value: E_ALL
; Production Value: E_ALL & ~E_DEPRECATED & ~E_STRICT
; http://php.net/error-reporting

/ Enable WP_DEBUG mode
define( \'WP_DEBUG\', true );

// Enable Debug logging to the /wp-content/debug.log file
define( \'WP_DEBUG_LOG\', true );

// Disable display of errors and warnings 
define( \'WP_DEBUG_DISPLAY\', false );
@ini_set( \'display_errors\', 0 );

// Use dev versions of core JS and CSS files (only needed if you are modifying these core files)
define( \'SCRIPT_DEBUG\', true );

Check this