how work? "Block chance applied to spell"?

i saw item with "50% Block chance applied to spell"

can anybody tell me what the function of this passive?
Normally you can only block Attacks. That passive allows you to block Spells as well, though with a lower chance.

So if I wear a shield with 24% block chance, I would only have a 12% chance to block Spells.
thank you :D

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