QGIS » QGIS Application

When doing WFS update transaction on any numeric field QGIS Server rejects null value. That would make sense only if the field cannot have null value, but this happens always for numeric fields. In this example is PostGIS table and field is integer and can contain null values.

To reproduce this is really simple just try to reset any numeric field to NULL value using WFS Update transaction and it will be rejected.

It's a regression because it's working normally on 2.18.

It's the same using WFS 1.1.0 and 1.0.0
Transaction is correctly formed and QGIS Server result is below:

<WFS_TransactionResponse xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0.0" xmlns="http://www.opengis.net/wfs" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.0.0/wfs.xsd" xmlns:ogc="http://www.opengis.net/ogc">
 <TransactionResult>
  <Status>
   <ERROR/>
  </Status>
  <Locator>Insert:polygons</Locator>
  <Message>Property conversion error on layer insert 'polygons'</Message>
 </TransactionResult>
</WFS_TransactionResponse>