topic Your are probably trying to in Product Forum https://community.blueprism.com/t5/Product-Forum/Check-whether-Field-in-collection-has-some-value-or-its-empty/m-p/74321#M26926 Your are probably trying to evaluate a non-defined field that has a null value as though it is text. The Blue Prism calculation stage has no concept of null (so there is no IsNull function available - which is an oversight worth raising in the ideas & enhancements area of this forum) - but instead of a proactive check you could have a retrospective check by catching the exception and checking for that left-hand value empty error - if that error occurs take your flow to the same rout as your field """" decision. Tue, 28 Nov 2017 14:25:00 GMT Denis__Dennehy 2017-11-28T14:25:00Z Check whether Field in collection has some value or its empty https://community.blueprism.com/t5/Product-Forum/Check-whether-Field-in-collection-has-some-value-or-its-empty/m-p/74320#M26925 im trying to check is my collection [Coll1.Field1]"". but is giving me following error Internal : Cannot perform operation when the left-hand value is empty. How to work with collection to find Is my field empty. Thank you. Tue, 28 Nov 2017 00:04:00 GMT https://community.blueprism.com/t5/Product-Forum/Check-whether-Field-in-collection-has-some-value-or-its-empty/m-p/74320#M26925 Vikas 2017-11-28T00:04:00Z Your are probably trying to https://community.blueprism.com/t5/Product-Forum/Check-whether-Field-in-collection-has-some-value-or-its-empty/m-p/74321#M26926 Your are probably trying to evaluate a non-defined field that has a null value as though it is text. The Blue Prism calculation stage has no concept of null (so there is no IsNull function available - which is an oversight worth raising in the ideas & enhancements area of this forum) - but instead of a proactive check you could have a retrospective check by catching the exception and checking for that left-hand value empty error - if that error occurs take your flow to the same rout as your field """" decision. Tue, 28 Nov 2017 14:25:00 GMT https://community.blueprism.com/t5/Product-Forum/Check-whether-Field-in-collection-has-some-value-or-its-empty/m-p/74321#M26926 Denis__Dennehy 2017-11-28T14:25:00Z