Error 0x80508028

Value: -2142207960 | 0x80508028 | 2152759336

What does it mean ?

ERR_MP_UNREFERENCED_8028  
Windows Defender has encountered an error when taking action on spyware or other potentially unwanted software.
Value: 32808 | 0x8028 | 0b1000000000101000

Where does it come from ?

FACILITY_WINDOWS_DEFENDER  
Windows Defender
Value: 80 | 0x050 | 0b01010000

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