Allowed memory size exhausted | WordPress.org

Hi,

I’m getting the following error whenever a user submits an appointment form (there are two on my site):

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 4544096 bytes) in /var/www/vhosts/adddetail.com/httpdocs/wp-includes/wp-db.php on line 2169

Thanks,
Kyle

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