Not all plugins are compatible with WordPress multisite as a number of consideration has to be taken into account (story for another day).
Below is a code snippet I often use to stop my plugins from activating or being used on Multisite.
Multisite is a WordPress feature which allows users to create a network of sites on a single WordPress installation or a collection of sites that all share the same WordPress installation.
Not all plugins are compatible with WordPress multisite as a number of consideration has to be taken into account (story for another day).
Below is a code snippet I often use to stop my plugins from activating or being used on Multisite.