Error No selection set on foundset ???

ERROR - Debug - No selection set on foundset with size 1 fs: FoundSet

Could someone help me or give me an idea what does this error mean?
We use servoy clients and this error comes out only on clients not on our developer.

Servoy version 5.2.17
Best regards.
Palacio

This problem is fixed in Servoy 6.1.4 and higher, see: https://support.servoy.com/browse/SVY-4229