Null check for a!map in a process

Question

Hi together, I have a "map" value in a process. 
 
 I realized that an IsNull/emptycheck rule I used in a gateway down the line, was failing of evaluating that there was (in my understanding) an empty value cast(
 'type!{http://www.appian.com/ae/types/2009}Boolean',
 length(a!flatten(ri!value)) = 0
) Even the new rules a!isNullOrEmpty ..... are not recognizing this properly. 
 Does anybody experienced this as well? (not difficult to solve, but it was pretty unexpected) 
 Kind regards, 
 Richard

Dimitris Soulovaris · Answer

Hi Richard, 
 You should check what the value of the map type is inside the process instance. If it's null then it's length will be 0 but if the map value has been initialize during the process and has a structure, then it's value will not be 0. Something like this: 
 
 What was the error message that you were getting in the process instance?

Null check for a!map in a process

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