Strange error message in console

Did you reach any conclusion on what causes this behavior?

We do have custom JavaScript in approximately 10% of the slides, but this happens exactly every time a slide auto-advances. These slides have video or audio being played automatically. 

could not find slide in string table npnxnabnsnfns01001000101 

ds-frame.desktop.min.js line 2382:112

{
  key: "getString",
  value: function(e) {
    var t = this.currLayout.string_table,
    n = this.frame.stringTables[t].string[e];
    return null == n ? (console.warn("could not find " + e + " in string table " + t), e.replace("acc_", "")) : n
  }
}