Error Message "Unable to add control" opening FF reports panel

Document ID : KB000112638
Last Modified Date : 31/08/2018
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Issue:
From time to time the following error message in the NFA GUI for FF reports :
Unable to add control: Object reference not set to an instance of an object.
Control: /RA/Ctrls/ReportBrowser.ascx at NQ.RA.Business.AgentPhysical.GetByRouterAddressInterfaceIndex(IPAddress routerAddress, UInt32 ifIndex, IFileLog iFileLog) [...]
Environment:
win2012
NFA 9.3.x
Cause:
some Forensic Report have failed during last run and put a long error msg in the
reporter.flowforensicsreport_definitions table  .

this msg cannot be displayed as exceding the javascript variable size .
Resolution:
clear  the error status for the FF reports in error from the mysql reporter.flowforensicsreport_definitions table :
mysql reporter
update flowforensicsreport_definitions set LastExecutionError=NULL ;
quit;