Fix Error #551 in phpMyAdmin 18.04

Error message containts :

Warning in ./libraries/plugin_interface.lib.php#551
count(): Parameter must be an array or an object that implements Countable

Solution:

You can also fix this by editing the library itself.

1. Make a backup first
   sudo cp /usr/share/phpmyadmin/libraries/plugininterface.lib.php /usr/share/phpmyadmin/libraries/plugininterface.lib.php.bak
2. Edit the library
   sudo nano /usr/share/phpmyadmin/libraries/plugin_interface.lib.php
3. Search for “if (! is_null($options) && count($options) > 0) {”
   or if not found then search for “if ($options != null && count($options) > 0) {”

Then replace it with “if ($options != null) {”

To search in Nano editor press CTRL and W

1. Save the file (CTRL and O)
2. Refresh the phpMyAdmin page and try agin.