Writing to NetCDF file does not always work if product has (x,y) dimensions

The following exception occurs:

java.lang.NullPointerException

at org.esa.snap.dataio.netcdf.nc.N4FileWriteable.addVariable(N4FileWriteable.java:144)

at org.esa.snap.dataio.netcdf.nc.N4FileWriteable.addVariable(N4FileWriteable.java:126)

at org.esa.snap.dataio.netcdf.nc.N4FileWriteable.addVariable(N4FileWriteable.java:120)

at org.esa.snap.dataio.netcdf.metadata.profiles.cf.CfGeocodingPart.addLatLonBands(CfGeocodingPart.java:217)

at org.esa.snap.dataio.netcdf.metadata.profiles.cf.CfGeocodingPart.preEncode(CfGeocodingPart.java:119)

at org.esa.snap.dataio.netcdf.metadata.profiles.beam.BeamGeocodingPart.preEncode(BeamGeocodingPart.java:100)

at org.esa.snap.dataio.netcdf.NetCdfWriteProfile.writeProduct(NetCdfWriteProfile.java:48)