Hi there,
We found a threat about this error message with a solution for Joomla 3.9.x:

Constant expression contains invalid operations in ... plugins/search/matukio/matukio.php on line 35

We get aware of this problem after updating to Joomla version 3.10.2.

Is the suggested solution as described in the older thread (changing line 35 in /matukio.php) still valid or is there a better, more recent way?

Thanx for feedback and
BR