Question

Unexpected Error

Forum|Forum|1 year ago
May 12, 2025
8 replies
0 views

Hi Everyone,

I got this error one time "at function a!flatten [line 5]: Cannot read the array length because "<local3>" is null" in expression rule. Unable to find the root cause because local3 is not used anywhere in the expression.

Can anyone please help me out.

harshas2775

Are you calling any sub rule within the rule you are calling this flatten function?

stefanhelzle0001

We need to see your code.

S

shubhamy3376Author

if(
  isnull(ri!array),
  true,
  length(
    a!flatten(ri!array)
  ) = 0
)

stefanhelzle0001

Do you try to create some null-checking expression? If yes, try isNullOrEmpty() or my function I posted about here: https://appian.rocks/2022/10/17/the-magic-of-null-checking

In your implementation, the problem is that the length() function is not happy with null values. So you would have to filter them out before, or use count().

davidj137213

I received this error in Java. In my case, it means that you are iterating over an array, and internally, your variable is converted into a different, local variable (e.g., local1 or local3). Check the elements of your array for null values.

S

shubhamy3376Author

I did check for null values, it does not occur any more.

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