Warning: GenericErrorHandler 2: array_keys()

After deleting all logged entries in Tracker a warning in main log:

> Warning: GenericErrorHandler 2: array_keys() expects parameter 1 to be array, null given on line 204 of file .../extensions/tracker/content/content.index.php

[Line 204](https://github.com/symphonists/tracker/blob/7f6b77ffabd64ea86fbfe680ee06bcba9858b8bd/content/content.index.php#L204)

Using Tracker v2.1.2