"Dev Mode: ON - Syntax error: Unable to get property 'icon' of undefined or null reference at line: undefined" error can appear in the Compliance blade reports after an upgrade of a Security Management Server with enabled Compliance blade from R77.20 or lower versions to R80.x.
Compliance Statuses contains "Low" instead of "Poor" and "High" instead of "Good".
Cause
Upgrade from R77.20 overrides the values set in the default database that was modified from R80 and above.