- if (setIdx == this.points.length - 1) {
- // We're the last series, so no unstacking is necessary.
- return unstackedPoint;
- }
-
- var points = this.points[setIdx + 1];
- if (points[row].xval == point.xval && // should always be true?
- points[row].yval) {
- unstackedPoint.yval -= points[row].yval;
+ // We need to iterate over setIdx just in case some series have invalid values
+ // at current row
+ for(setIdx++; setIdx < this.points.length; setIdx++) {
+ var nextPoint = this.points[setIdx][row];
+ if (nextPoint.xval == point.xval && // should always be true?
+ Dygraph.isValidPoint(nextPoint)) {
+ unstackedPoint.yval -= nextPoint.yval;
+ break; // stop at first valid point
+ }