NSPlaceholderArray error

[mrafayfarooq]

I can't execute the code. it's crashing on line
featureLayer.selectFeatures(with: selectQuery, selectionMethod: .new)
on pickerView function stating the following error.
'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'