I am getting this error:
Error Domain=com.esri.arcgis.runtime.error Code=15 "Invalid call." UserInfo={NSLocalizedFailureReason=Unable to evaluate arcade expression. Evaluation_error_code::unexpected_null_value Line :11, NSLocalizedDescription=Invalid call., Additional Message=Unable to evaluate arcade expression. Evaluation_error_code::unexpected_null_value Line :11}
Works fine in the Map Viewer popup, but not in Field Maps.