Thank you Sesso!! 

This is purely a software issue.  It was throwing an error for a guest
(not logged in) when they were trying to add product to the cart.  The
issue has been resolved.  I was trying to find the error in the logs and
could not find it and was wondering why.

On 2017-07-10 12:04, Sesso wrote:

> Look in the DB and make sure your user really exists. 
> 
> jason 
> 
>> On Jul 10, 2017, at 12:01 PM, techlists@phpcoderusa.com wrote: 
>> 
>> 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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