If tracking numbers are failing to be updated in your Magento store and you find the error Call to a member function getUsername() on a non-object on your order activity screen, this is usually caused by a caching issue in Magento.
Fixing Call to a member function getUsername() on a non-object in Magento
Ask your Magento developer to empty the following locations on your server.
- <magento website>/var/cache
- <magento website>/var/locks
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