NaN for CPU graph Fortigate 110C

[codus]

I'm trying to create a graph for CPU and Memory Usage of a Fortigate 110C.
The graph shows the Memory Usage successfully, but returns a NaN for CPU Usage.

I checked the Cacti Log and found this:

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07/26/2013 02:12:01 PM - CMDPHP: Poller[0] Host[2] DS[8] WARNING: Result from SNMP not valid.  Partial Result: U
07/26/2013 02:12:01 PM - CMDPHP: Poller[0] Host[2] DS[8] SNMP: v2: *.*.*.*, dsname: fortigate_cpu_util, oid: .1.3.6.1.4.1.12356.101.4.1.3, output: U

Running snmpwalk for this OID gives me a correct value:

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SNMPv2-SMI::enterprises.12356.101.4.1.3 = Gauge32: 2

I created the Memory Graph in exactly the same way, except a different OID, and that one does work.

[BSOD2600]

Both manual and cacti queries using the snmp version?
Possibly try changing the snmp timeout and/or decreasing the 'Maximum OID's Per Get Request'