If it's driver's side, the most likely cause is the sensor in the female end of the buckle that tells the airbag that the driver is belted. I had a buddy who had this happen in another car, not a Nissan, and he found out that it's actually not that uncommon of a problem in proportion. If it's passenger, my best guess is some weight was on it, giving the sensor the impression a passenger was seated but unbelted
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