[RSS Feed/News] check if user is not null

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How can i check if a user is null or not? I try to use this code but i have no idea :(


Code:

Code:
<xf:if is=“$user != null”>
</xf:if>

This is the error i want to fix:
Code:

Code:
ErrorException: Template error: [E_WARNING] Attempt to read property "dbtech_shop_purchase" on null internal_data/code_cache/templates/l2/s4/public/5minutos_message_banners.php:10
Generated by: Unknown account Mar 12, 2023 at 12:54 PM
Stack trace
#0 internal_data/code_cache/templates/l2/s4/public/5minutos_message_banners.php(10)...

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