A quick fix is to run this command:

sudo brctl setageing br0 0

This causes the aging of the MAC address to time out immediately or in 0 seconds, which delete the entry frmo the FDB (Forwarding Database) and causes the error to go away.  The default time is 300 seconds or 5 minutes.

You can also add it under your br0 definition like this in /etc/network/interfaces to make it permanent and automatic:

auto br0
iface br0 inet static
  address 192.168.1.2
  netmask 255.255.255.0
  gateway 192.168.1.1
  bridge_ports bond0
  bridge_ageing 0

bridge_ageing 0 = sudo brctl setageing br0 0

From the brctl manual:

       brctl setageing sets the ethernet (MAC) address  ageing
       time,  in seconds. After seconds of not having seen a frame com‐
       ing from a certain address, the bridge  will  time  out  (delete)  that
       address from the Forwarding DataBase (fdb).
 

For more information on setting up Linux bonding bond0 with br0 check this guide.

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