You are hitting the following known defect, which also affects the AsyncOS 8.5.6:
CSCun76328 - DLP application fault seen after upgrading to 8.5.0-473
After upgrading the Email Security Appliance from AsyncOS 8.0.1 to 8.5.0-473, the follwoing application fault might be encountered:
An application fault occurred: ('dlp/config.py make_actions_filterset|1200', "", "'NoneType' object has no attribute 'get_default_restriction'", '[egg/filters.py config_change|11386] [dlp/config.py rebuild_dlp_actions_filterset|1177] [dlp/config.py make_actions_filterset|1200]')
upgrading an Email Security Appliance from AsyncOS 8.0.1 to 8.5.0-473. After initial reboot of the appliance as part of the upgrade process the above application fault might be encountered.
not known so far
Further Problem Description:
This is an intermittent issue with no known side-effects. The application fault happens at the point where message/content filter configuration is loaded. Any subsequent configuration changes should not be affected by this. Making a dummy configuration change to filters if this application fault is seen will ensure the latest consistent configuration is picked up
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