Interface Definition: Expression evaluation error at function a!imageField [line 58]: The image at index 1 in an image gallery component [label=""] has an invalid value for "document". "document" must not be null.

Question

a!imageField( label: "", labelPosition: "ABOVE", images: { a!documentImage( document: ri!Vehicle['recordType!{691ee044-4a47-4798-bd87-7f96ca362496}AX Vehicle.fields.{6927f3f6-187b-457b-a2b3-ee2ff6970659}vehicleImage'] ) }, size: "MEDIUM", isThumbnail: false, style: "STANDARD" ) 
 
 I'm building a process model that displays maintenance request. In that I'm trying to add Vehicle details View interface in the column but after doing that I'm getting the above error. How should I fix this ?

Mathurambika M · Accepted Answer

Hello Kishore, 
 The reason for this issue is as the error message indicates: the 'vehicle image' record field doesn't have any documents (i.e., it holds a null value). To address this, you should incorporate a null check to handle the situation. 
 a!imageField(
 images: if(
 a!isNullOrEmpty(ri!doc),
 {},
 { a!documentImage(document: ri!doc) }
 )
)

Interface Definition: Expression evaluation error at function a!imageField [line 58]: The image at index 1 in an image gallery component [label=""] has an invalid value for "document". "document" must not be null.

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