Is there is solution to avoid CRC and invalid word ERROR.
CRC discard cause can be of different reason. defective SFP or Cable, wrong parameters settings, corrupted data transmissions, and much more.
if everything of that is healthy and correctly configured, then you can try to reduced CRC.
But as per my experience and this is my opinion , you cannot exclude or avoid CRC complete, because some CRC Error in certain circumstance are wrong message.
Again, this is my opinion and from my point of view make no sense to investigated some wrong error.