Firewall alert, Description: Suspiciously small datagram fragment. possibly a fragmentation attack

One user of PSB 12.01 is receiveing this warning: Firewall alert, Description: Suspiciously small datagram fragment. Possibly a fragmentation attack.
She´s connected to our LAN. The address a IPV6 (belongs to a printer which resides on the same LAN). No other user gets this message.
OS is Windows 7.
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Hello GoldenNugget,
Please check in PSB GUI Settings window, Network Connections > Firewall > Settings tab > Firewall settings the parameter "Block IP fragments shorter than". What fragment size do you have? Default value is 128.
Best regards,
Vad
Set as 128 byte.
You can try to decrease it to 64 or 32 bytes for example, and check if it helps.
Best regards,
Vad