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After upgrading php from 7.0 to 7.2 it shows me the following message :

Warning: count(): Parameter must be an array or an object that implements Countable in \qa-theme\lion\core\Theme.php on line 457

Q2A version: 1.8.3

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These errors are quite normal due to the upgrade. Usually they happen because the variable expects to hold an array and it ends up holding a null value.

Probably you might want to first check if the variable is an array and then perform the actual action. E.G.:

if (is_array($variable) && count($variable) > 2) { ...
...