biasCorrection with delta method returns NA

[scbrown86]

Hi,
Using the delta bias correction method returns NA if a window is not set? Also, NA's are returned depending on the values used in window

library(downscaleR)
require(climate4R.datasets)
data("EOBS_Iberia_tas")
data("CORDEX_Iberia_tas")
y <- EOBS_Iberia_tas
x <- CORDEX_Iberia_tas
delta_bc <- biasCorrection(y = y, x = x, method = "delta")
summary(delta_bc$Data) ## All NA

delta_bc <- biasCorrection(y = y, x = x,
                           method = "delta",
                           window = c(30, 15))
summary(delta_bc$Data) # worked

delta_bc <- biasCorrection(y = y, x = x,
                           method = "delta",
                           window = c(365, 183))
summary(delta_bc$Data) # All NA

delta_bc <- biasCorrection(y = y, x = x,
                           method = "delta",
                           window = c(1, 1))
summary(delta_bc$Data) # worked