diff --git a/script.js b/script.js
index b7b09b7..5b73cf3 100644
--- a/script.js
+++ b/script.js
@@ -827,13 +827,12 @@ function showEonstripDetail(index, startCob) {
             const startDate   = fromCobiets(ev.cobStart).toLocaleString('en-US', optsShort);
             const endDate     = fromCobiets(ev.cobEnd).toLocaleString('en-US', optsShort);
             const seriesStart = formatCobieTimestamp(ev.seriesStart);
-            const seriesEnd   = isFinite(ev.seriesEnd) ?
-                formatCobieTimestamp(ev.seriesEnd) : '∞';
+            const seriesEnd   = isFinite(ev.seriesEnd) ? formatCobieTimestamp(ev.seriesEnd) : '∞';
 
             tooltip.innerHTML =
                 `<strong>${ev.label}</strong><br>` +
                 `Start: ${startStr} (${startDate})<br>` +
-                `End: ${endStr} (${endDate})<br>` +
+                (ev.cobEnd > ev.cobStart ? `End: ${endStr} (${endDate})<br>` : '') +
                 `Series: ${seriesStart} – ${seriesEnd}`;
             elem.appendChild(tooltip);
         timeline.appendChild(elem);