error in HYDRO_RST file

[wuesh]

In the HYDRO_RST file, the soil moisture content variables such as smc1 and smc2 have grid values of 1.0, while in the RESTART file, the corresponding grid values are -999999994495727300000000000000000.0. What does this mean? Is this an error? Do I need to handle this phenomenon?
I would be very grateful if someone could offer help.