Error in if/while (condition) {: missing Value where TRUE/FALSE needed

Question

I received this error message:

Error in if (condition) { : missing value where TRUE/FALSE needed

or

Error in while (conditi         


        

Answer 1

I ran into this when checking on a null or empty string

if (x == NULL || x == '') {

changed it to

if (is.null(x) || x == '') {