Does it happen when the b string is fretted? Or is it when its open?
If it doesen't do it when fretted (open), then it could be the slot at the nut, or if it does it both open and fretted it could be the bridge saddle.
Or it could just be a bad string too.
Let me know, and I'll try and help you nail it down.
Regards,
Wyatt
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