PHP error: count(): Parameter must be an array or an object that implements Countable

Description

I see in the log this PHP error

Sep  6 15:29:34 buster php: FusionDirectory [fd-admin]: (view) error: PHP error: count(): Parameter must be an array or an object that implements Countable (/usr/share/fusiondirectory/include/class_config.inc, line 806)

Distribution Name and Version

Debian 10

FusionDirectory Version

1.4

PHP version used

PHP7

Origin of php packages

Distribution

Steps to Reproduce

Follow the setup

Expected behavior:

No php error

Actual behavior:

We have a php error