diff --git a/R/VizRobinson.R b/R/VizRobinson.R
index 2e00161c4da453ee352d4d53506ea65e6500ff4d..63f5c7faa773e2fbf4d4ce8982362413771f7868 100644
--- a/R/VizRobinson.R
+++ b/R/VizRobinson.R
@@ -246,12 +246,14 @@ VizRobinson <- function(data, lon, lat, lon_dim = NULL, lat_dim = NULL,
     if (!identical(dim(mask), dim(data))) {
       stop("Parameter 'mask' must have the same dimensions as 'data'.")
     } else if (is.numeric(mask)) {
+      mask[which(is.na(mask))] <- 0
       if (all(mask %in% c(0, 1))) {
         mask <- array(as.logical(mask), dim = dim(mask))
       } else {
         stop("Parameter 'mask' must have only TRUE/FALSE or 0/1.")
       }
     } else if (is.logical(mask)) {
+      mask[which(is.na(mask))] <- F
       if (!all(mask %in% c(T, F))) {
         stop("Parameter 'mask' must have only TRUE/FALSE or 0/1.")
       }