wpsnoop Function not_null() conflicts found in 1 plugin

A php function called not_null() is used in 1 wordpress plugin/theme and could produce a potential conflict if the wrong combination of themes and plugins is used on your site.

To prevent this from happening developers are encouraged to use namespaces and scopes that isolate their functions from colliding with other functions but this is not always done correctly.

We hope this reference helps you to find PHP Fatal error: Cannot redeclare not_null()

The following plugin registers a function called not_null():

Plugin
Booking Ultra Pro CORE