No subject

        var dividerElement = this._headerElement.firstChild;
        for (var i = 0; i <= dividerCount; ++i) {
            if (!dividerElement) {
                dividerElement = document.createElement("div");
                dividerElement.className = WebInspector.TimelineRuler.DividerElementStyleClassName;
                this._headerElement.appendChild(dividerElement);

                var labelElement = document.createElement("div");
                labelElement.className = WebInspector.TimelineRuler.DividerLabelElementStyleClassName;
                dividerElement._labelElement = labelElement;
                dividerElement.appendChild(labelElement);
            }

            // ...

            var dividerTime = firstDividerTime + (sliceTime * i);

            // ...

            dividerElement._labelElement.textContent = isNaN(dividerTime) ? "" : Number.secondsToString(dividerTime - this._zeroTime, true);
            dividerElement = dividerElement.nextSibling;
        }

The exceptions happens on the second to last line in the loop. dividerElement._labelElement is undefined, but it should never be.</pre>
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