Finding errors in the logs

Hi,

I am running Magento version 2 on Ubuntu 16.04.2 LTS running PHP 7 FPM.
Magento was throwing an error - invalid user ID.

I'm looking at the logs for errors and am not finding anything that
looks like what I am looking for.

The site is full time SSL.

The SSL vhost is configured "ErrorLog /var/log/apache2/ssl_error_log".

Is there some other place I should be looking?

Thanks in advance for your help!!

Keith---------------------------------------------------
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