PS > $null | ConvertTo-Json -Compress
ConvertTo-Json: Value cannot be null. (Parameter 'type')
PS > Get-Error

Exception             :
    Type       : System.ArgumentNullException
    Message    : Value cannot be null. (Parameter 'type')
    ParamName  : type
    TargetSite :
        Name          : VerifyValueAndType
        DeclaringType : System.Text.Json.JsonSerializer
        MemberType    : Method
        Module        : System.Text.Json.dll
    StackTrace :
   at System.Text.Json.JsonSerializer.VerifyValueAndType(Object value, Type type)
   at System.Text.Json.JsonSerializer.Serialize(Object value, Type inputType, JsonSerializerOptions options)
   at Microsoft.PowerShell.Commands.JsonObject.ConvertToJson2(Object objectToProcess, ConvertToJsonContext& context) in
 C:\Users\1\Documents\GitHub\iSazonov\PowerShell\src\Microsoft.PowerShell.Commands.Utility\commands\utility\WebCmdlet\J
sonObject.cs:line 538
   at Microsoft.PowerShell.Commands.ConvertToJsonCommand2.EndProcessing() in C:\Users\1\Documents\GitHub\iSazonov\Power
Shell\src\Microsoft.PowerShell.Commands.Utility\commands\utility\WebCmdlet\ConvertToJsonCommand.cs:line 252
   at System.Management.Automation.Cmdlet.DoEndProcessing() in C:\Users\1\Documents\GitHub\iSazonov\PowerShell\src\Syst
em.Management.Automation\engine\cmdlet.cs:line 187
   at System.Management.Automation.CommandProcessorBase.Complete() in C:\Users\1\Documents\GitHub\iSazonov\PowerShell\s
rc\System.Management.Automation\engine\CommandProcessorBase.cs:line 590
    Source     : System.Text.Json
    HResult    : -2147467261
CategoryInfo          : NotSpecified: (:) [ConvertTo-Json], ArgumentNullException
FullyQualifiedErrorId : System.ArgumentNullException,Microsoft.PowerShell.Commands.ConvertToJsonCommand2
InvocationInfo        :
    MyCommand        : ConvertTo-Json
    ScriptLineNumber : 1
    OffsetInLine     : 9
    HistoryId        : 1
    Line             : $null | ConvertTo-Json -Compress
    PositionMessage  : At line:1 char:9
                       + $null | ConvertTo-Json -Compress
                       +         ~~~~~~~~~~~~~~~~~~~~~~~~
    InvocationName   : ConvertTo-Json
    CommandOrigin    : Internal
ScriptStackTrace      : at <ScriptBlock>, <No file>: line 1