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I'm using Quick Apps 6.4 (Build 2014.11.20). I have three lists that we'll call A, B, and C.
A has a lookup to C, and B also has a lookup to C. The lookup fields do not require a value to be set in either list. I have a page in Sharepoint using a qListForm which is successfully updating A, and updating the lookup in B as well via Dependent lists. This works whether A has a value set for the lookup field or not.
I'm trying to create a qListForm to create a new item in B, and I want to set the lookup field from a session value storing an A item. In my display fields setup I'm choosing the lookup field in B to be of field type "Consume value from a session". If the A item has a value for the lookup, everything works fine. However, if the A item does not have a value for the lookup field, then I get an error: "The following error occurred: Object reference not set to an instance of an object."
I'm looking for any workaround without having to make my lookup field a required field.
I am sorry, I cannot find the workaround with this issue. I have logged this bug for the team, the ID is #462413.
Is this something that will be addressed in 6.5?
That will be addressed in the release note if it is fixed.