Expression rules

 I have an issue with expression rule. my rule is as follows:

a!queryEntity(
entity: cons!LCW_BUSINESS_UNIT_ENTITY,
query: a!query(
filter: if(
rule!APN_isEmpty(ri!businessDivision.id),
{},
a!queryFilter(
field: "businessDivision.id", 
operator: "=", 
value: ri!businessDivision.id)
),
pagingInfo: a!pagingInfo(
startIndex: 1, 
batchSize: -1, 
sort: a!sortInfo(
field: "order", 
ascending: true
)
)
),
fetchTotalCount: true
)

but when i execute this i get the following error

Expression evaluation error at function a!queryEntity: Cannot apply a filter with a blank field name.

can someone pls help?

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