https://github.com/adaptlearning/adapt-contrib-spoor/blob/master/js/adapt-offlineStorage-scorm.js#L115

gistfile1.txt

getCustomStates: function() {
  var isSuspendDataStoreEmpty = _.isEmpty(suspendDataStore);
  if (!isSuspendDataStoreEmpty && suspendDataRestored) return _.clone(suspendDataStore);

  var dataAsString = scorm.getSuspendData();
  if (dataAsString === "" || dataAsString === " " || dataAsString === undefined) return {};

  var dataAsJSON = this.tryParseJsonWithDefault(dataAsString, {});
    
  if (!isSuspendDataStoreEmpty && !suspendDataRestored) dataAsJSON = _.extend(dataAsJSON, suspendDataStore);
  return dataAsJSON;
},

tryParseJsonWithDefault: function (text, defaultValue) {
  try {
    return JSON.parse(text);
  }
  catch (ex) {
    return defaultValue;
  }
},