mORMot Open Source

Sorry for the code provided, it's for testing only.

I use Delphi 10.2.3 Tokyo.

Could you examine code in mormot.db.proxy or trace back thru ToDataset() function.

constructor TSqlDBProxyStatementRandomAccess.Create(Data: PByte; DataLen: integer;
  DataRowPosition: PCardinalDynArray; IgnoreColumnDataSize: boolean);
var
  i, f: PtrInt;
  reader: PByte;
begin
  fLastGotoRow := -1;
  inherited Create(nil);
  InternalHeaderProcess(Data, DataLen);

The constructor inherited Create(nil) that passed thru

constructor TSqlDBStatementWithParamsAndColumns.Create(
  aConnection: TSqlDBConnection);

so aConnection was passed as nil. This could be the cause.