NULL value comparison in IF statement
If you have field in DE that its value is not always populated for a particular row (customer) and you test field value against any value cloud page will throw an 500 – internal server error.
%%[
var @field;// null value
if @field == 4 then
//500
endif
]%%To fix this, you will simply need to add another AND-condition to test field value for NULL with NOT IsNull()
%%[
var @field;// null value
if NOT IsNull(@field) AND @field == 4 then
//do something
endif
]%%
