# Tracking email opening

**URL:** <https://forum.mautic.org/t/tracking-email-opening/5706>\
**Category:** Product Support\
**Created:** [March 23, 2016, 5:05pm UTC](https://forum.mautic.org/t/tracking-email-opening/5706 "2016-03-23T17:05:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![pietromantovani](https://avatars.discourse-cdn.com/v4/letter/p/f07891/32.png) [@pietromantovani](https://forum.mautic.org/u/pietromantovani)\
**Post date:** [March 23, 2016, 5:05pm UTC](https://forum.mautic.org/t/tracking-email-opening/5706/1 "2016-03-23T17:05:00Z")

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I’ve installed a new Mautic from scratch and I’m experiencing a problem I never face with. I can’t track email opening (clicks on links are tracked OK).  
  
I’ve got the following errors, could someone have a look?  
  
  
  
[2016-03-23 16:02:39] mautic.NOTICE: PHP Notice: unserialize(): Error at offset 152 of 833 bytes - in file /var/www/vhosts/MYDOMAIN/httpdocs/vendor/doctrine/dbal/lib/Doctrine/DBAL/Types/ArrayType.php - at line 58 [] []  
  
[2016-03-23 16:02:39] mautic.CRITICAL: Uncaught PHP Exception DoctrineDBALTypesConversionException: “Could not convert database value “a:7:{s:18:”{unsubscr…” to Doctrine Type array" at /var/www/vhosts/MYDOMAIN/httpdocs/vendor/doctrine/dbal/lib/Doctrine/DBAL/Types/ConversionException.php line 46 {“exception”:"[object] (Doctrine\DBAL\Types\ConversionException(code: 0): Could not convert database value “a:7:{s:18:”{unsubscr…" to Doctrine Type array at /var/www/vhosts/MYDOMAIN/httpdocs/vendor/doctrine/dbal/lib/Doctrine/DBAL/Types/ConversionException.php:46)"} []

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<div class="post-metadata">

**Author:** ![pietromantovani](https://avatars.discourse-cdn.com/v4/letter/p/f07891/32.png) [@pietromantovani](https://forum.mautic.org/u/pietromantovani)\
**Post date:** [March 23, 2016, 5:05pm UTC](https://forum.mautic.org/t/tracking-email-opening/5706/2 "2016-03-23T17:05:00Z")

</div>

I’ve installed a new Mautic from scratch and I’m experiencing a problem I never face with. I can’t track email opening (clicks on links are tracked OK).  
I’ve got the following errors, could someone have a look?

[2016-03-23 16:02:39] mautic.NOTICE: PHP Notice: unserialize(): Error at offset 152 of 833 bytes - in file /var/www/vhosts/MYDOMAIN/httpdocs/vendor/doctrine/dbal/lib/Doctrine/DBAL/Types/ArrayType.php - at line 58 [] []  
[2016-03-23 16:02:39] mautic.CRITICAL: Uncaught PHP Exception DoctrineDBALTypesConversionException: “Could not convert database value “a:7:{s:18:”{unsubscr…” to Doctrine Type array" at /var/www/vhosts/MYDOMAIN/httpdocs/vendor/doctrine/dbal/lib/Doctrine/DBAL/Types/ConversionException.php line 46 {“exception”:"[object] (Doctrine\DBAL\Types\ConversionException(code: 0): Could not convert database value “a:7:{s:18:”{unsubscr…" to Doctrine Type array at /var/www/vhosts/MYDOMAIN/httpdocs/vendor/doctrine/dbal/lib/Doctrine/DBAL/Types/ConversionException.php:46)"} []