A null parameter has been passed for month function

Question

When I write a code "month(fv!item.asDate) = local!month", why it's showing a result A null parameter has been passed. How to resolve that part? 
 Also I put that part 
 
 if( a!isnullOrEmpty(index(fv!item, "asDate", null)), false, contains( tointeger(local!month), month(index(fv!item, "asDate", null)) ) ), 
 
 but same error as it is

Sanchit Gupta (Xebia) · Answer

You need to first check that the date you are passing in month() is not null, add an if condition to it. 
 if(
 isnull(fv!item.asDate),
 false,
 month(fv!item.asDate) = local!month
)

Harshit Bumb (Appyzie) · Answer

Please don't use isnull(). It was never a safe option. Instead, go for a!isnullorempty() should cover more usecases.

Mike Schmitt · Answer

Unknown said: What is in ri!taskProductionList? 
 Namely, we need to verify that the "asDate" property of that rule input actually contains Date data. The month() function (afaik) typecasts its input as date, so for example if OP is trying to call this function on String data, it'll still return the same error message as seen here.

A null parameter has been passed for month function

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