Write empty value through PCO

Hi,
I have a tag on my OPC server with datatype String.
When I write an empty value to the tag through PCo I always get the error: "Invalid tag value for x".
Writing a space works but this is not good because the PLC will interpret this differently.
How can I write an empty value to a tag?
I am using Kepware OPC and PCO 15.0.0.1959
Thanks

If i comment out.write(value) it prints fine to file. below it saves "test" at every columns.
So that narrow it to this line "String value = (String)custTable.getValueAt(j, k);"
for (int j = 0; j < rows; j++){
          for (int k = 0; k < columns; k++){
          String value = (String)custTable.getValueAt(j, k);
               // out.write(value);
                out.write("test");
                out.newLine();
                out.close();getValueAt dont return any data at all when it meet an empty column?

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