From 48eef75e74df187ad8374886e42e1105ac504cb4 Mon Sep 17 00:00:00 2001
From: David Rose <david@ddrose.com>
Date: Tue, 24 Sep 2002 23:40:26 +0000
Subject: [PATCH] assertion

---
 direct/src/interval/Interval.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/direct/src/interval/Interval.py b/direct/src/interval/Interval.py
index a82c8701d9..6ea262398d 100644
--- a/direct/src/interval/Interval.py
+++ b/direct/src/interval/Interval.py
@@ -36,6 +36,8 @@ class Interval(DirectObject):
         # if it should be ignored in this case.
         self.openEnded = openEnded
 
+        assert(self.duration >= 0)
+
     def getName(self):
         return self.name