One invalid QGIS layer makes all layers not to work/be served

When there is one layer that is invalid in QGIS project none of the layers are working: I mean if layer A is invalid and layer B is perfectly fine then WMS GetMap requests for layer B return 500 server error and in QGIS server logs I can see that B layer request fails because layer A is invalid. How to disable this behaviour of QGIS?