diff --git a/src/Gantt.js b/src/Gantt.js
index 3ebc2d3..b1a3819 100644
--- a/src/Gantt.js
+++ b/src/Gantt.js
@@ -98,6 +98,11 @@ export default function Gantt(element, tasks, config) {
 			task._start = moment(task.start, self.config.date_format);
 			task._end = moment(task.end, self.config.date_format);
 
+			// make task invalid if duration too large
+			if(task._end.diff(task._start, 'years') > 10) {
+				task.end = null;
+			}
+
 			// cache index
 			task._index = i;