Is it a bug of the cisco OS?

hi,
i have a cisco 1230 access point and i m using snmp with it, so there are some fields in cisco mib "ciscoDot11AssociationMIB", that doesn t return any value : the wired interface of the AP gives me all informations (mac adress, ip adress,...) but the radio one doesn t give me anything, the field "cDot11ClientAddress" which (normally) returns the mac adress of the wired devices connected with the AP (even when my laptop is connected to), is empty whereas this is the index of this table
what can i do? is it a bug of the OS cisco?
if someone has any idea please tell me because it s very important for me
thanks in advance

i solve my problem

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