NCX2 distribution warning in CEV

[jaehyukchoi]

FER::CevPrice(seq(0.1, 2, 0.1), 1, 1, sigma=0.1, beta=0.5)

causing a warning message

Warning message:
In stats::pchisq(800, df = 4, ncp = 400, lower.tail = F) :
  full precision may not have been achieved in 'pnchisq'

strike=2 corresponds to

stats::pchisq(800, df=4, ncp=400, lower.tail=F)

• It is just a warning. The value seems OK. How to make the warnings silent?
• Also consider Hagan's equivalent BS volatility for very small volatility.