A couple of weeks ago we started getting this error in our app, without performing any changes in it's code:

The code behind this, that recovers the values from a SQL View, is the following:

We get the error only when using the mobile app and not when using a web browser. All data is being loaded corectly. The error is being shown only the first time when we go to this screen. To reproduce it again, reopening the app is being needed.
In other cases, the reason of this error message involved some boolean variables in the Filter statement but in this case we don't use any. I would be more than grateful if anyone could help.