diff --git a/NEWS.md b/NEWS.md
index e19471d2e2..836e815171 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,7 @@
 # ggplot2 (development version)
 
+* `linetype = NA` is now interpreted to mean 'no line' instead of raising errors
+  (@teunbrand, #6269).
 * `geom_ribbon()` now appropriately warns about, and removes, missing values 
   (@teunbrand, #6243).
 * `guide_*()` can now accept two inside legend theme elements:
diff --git a/R/utilities-grid.R b/R/utilities-grid.R
index c231f0b279..a935d5b38f 100644
--- a/R/utilities-grid.R
+++ b/R/utilities-grid.R
@@ -41,6 +41,9 @@ gg_par <- function(..., stroke = NULL, pointsize = NULL) {
     stroke[is.na(stroke)] <- 0
     args$fontsize <- pointsize * .pt + stroke * .stroke / 2
   }
+  if (!is.null(args$lty) && anyNA(args$lty)) {
+    args$lty[is.na(args$lty)] <- if (is.character(args$lty)) "blank" else 0
+  }
 
   inject(gpar(!!!args))
 }