From version 3.8.8 when we create an editor field the variable was saved at customfield_value.
From 3.8.9 till 4.0.12 it is saving this value at customfield_params.
At 4.0.14 this value is saving in customfield_value again.
You can check that at administrator/models/customfields at case 'X'
Really Milbo? What the heck..