CageFS plugin error: Deprecated: strstr Passing null to parameter #1 ($haystack)

Issue

In DirectAdmin, the CageFS plugin gives error:

Deprecated: strstr(): Passing null to parameter #1 ($haystack) of type string is deprecated in /usr/local/directadmin/plugins/cagefs/admin/commands.php on line 32 Warning: Undefined array key "action" in /usr/local/directadmin/plugins/cagefs/admin/index.html on line 54 Warning: Undefined array key "action" in /usr/local/directadmin/plugins/cagefs/admin/index.html on line 63

Environment

• DirectAdmin
• CageFS plugin
• CloudLinux OS
• CloudLinux Manager

Solution

The CageFS plugin is deprecated, and its usage is no longer recommended. We advise removing the plugin from the DirectAdmin panel, since its functionality already included in the CloudLinux Manager
The plugin can be removed from the "Plugin administrator" interface:

 
Note: This will not have any impact on CageFS config or CageFS enabled users. Only the plugin will be removed. 

Cause

The CageFS plugin is deprecated.

Useful links

CageFS user interface is now part of CloudLinux LVE Manager