diff --git a/debug-viewer/GstDebugViewer/Plugins/Timeline.py b/debug-viewer/GstDebugViewer/Plugins/Timeline.py
index 1313491a00..ba5485e29d 100644
--- a/debug-viewer/GstDebugViewer/Plugins/Timeline.py
+++ b/debug-viewer/GstDebugViewer/Plugins/Timeline.py
@@ -289,9 +289,10 @@ class VerticalTimelineWidget (gtk.DrawingArea):
             return
 
         first_y, cell_height, data = self.params
+        if len (data) < 2:
+            return
         first_ts, last_ts = data[0][0], data[-1][0]
         ts_range = last_ts - first_ts
-
         if ts_range == 0:
             return