To fix this error, simply update your Prestashop online store to version 8.0.5 or 8.1.1.

If you do not want to update your Prestashop store, you can apply the following patch:

# Open the file : /ROOT/config/smarty.config.inc.php

# Locate this line of code in the file :

smartyRegisterFunction($smarty, 'modifier', 'end','end');# Replace it with the following code :

smartyRegisterFunction($smarty, 'modifier', 'end','smarty_endWithoutReference');# Add the following code at the end of the file :

function smarty_endWithoutReference($arrayValue) {
      return end($arrayValue);
}# Save the file.