diff --git a/R/validateSchema.R b/R/validateSchema.R
index 11bf4b9..5ecb629 100644
--- a/R/validateSchema.R
+++ b/R/validateSchema.R
@@ -146,6 +146,9 @@ validateSchema <- function(schema = NULL, input = NULL){
 
         # ignore header rows
         varProp$row <- varProp$row[!varProp$row %in% headerRows]
+        if(length(varProp$row) == 0){
+          varProp$row <- NULL
+        }
       }
     }