Is there a way to restore the score?

Captivate is set up to have two slides (test) and each worth 10 points.  I started the test, answered the first question correctly, quit the test at the second slide, got back to the test directly to the second slide, answered it correctly.  Captivate thought that I failed the test because the score for the first question was missing.

JavaScript is used to set the starting slide to the second one after going back to it.  'cpAPIInterface.setVariableValue("cpQuizInfoPointsscored", score)' does not work.  It seems that it is ReadOnly.  Thanks in advance.