Couldn't find LSD value in R

Hello guys, while performing post-hoc test (Duncan test) I used this code and it says the critical range table is null but works perfectly with other variables. Please help.

anova(lm(PH.90~rep+sowing+variety+variety*sowing))

x<- with(fit, LSD.test(PH.90, variety, 31, 127.24, 0.5))
print(x)

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