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Use of the iRule command 'ACCESS::session data get -secure <empty variable>' might fail intermittently, which might result in BIG-IP traffic processing failures and a Tcl error logged in /var/log/ltm: err tmm2[22011]: 01220001:3: TCL error: /Common/sp_irule <HTTP_REQUEST> - variable lookup failed (line 1)Illegal argument (line 1) (line 1) invoked from within "ACCESS::session data get -secure "session.saml.last.attr.name.foo"".
Connection drop.
Use of -secure flag to get data from an empty variable from ACCESS::session inside iRules.
Use an iRule catch statement.
The system now checks for empty variable value before attempting decryption.
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