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Adum2250 immunity issue


I am facing problems with Adum2250 I²C isolator

I my application, we have electromechanical relays that make Adum2250 internal detector to trig when the relay commutes

I have attached the waveforms : 

(BLUE) = Clock side 1 (5V)

(PINK) = Clock Side 2 (3,3V)

(YELLOW) = Relay output (230Vac - 50Hz)

The distance between the relay and the chip is around 3cm

Question : what would you suggest to fix the problem ?