From 7c4ccb88417c23f53e0c24c4cb025b9d35b1da76 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 2 Jul 2018 14:44:23 +0300
Subject: [PATCH] Don't link keyframes with zero interval

Fixes an issue where a lone instant keyframe at the end of the animation
would produce bad values as the iterator tries to divide by zero.
---
 source/animation.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/source/animation.cpp b/source/animation.cpp
index 1cfb533f..e82a92a8 100644
--- a/source/animation.cpp
+++ b/source/animation.cpp
@@ -78,9 +78,10 @@ void Animation::add_keyframe(const Time::TimeDelta &t, const RefPtr<const KeyFra
 	if(realloc)
 	{
 		for(unsigned i=1; i<keyframes.size(); ++i)
-			keyframes[i].prev = &keyframes[i-1];
+			if(keyframes[i].prev)
+				keyframes[i].prev = &keyframes[i-1];
 	}
-	else if(keyframes.size()>1)
+	if(keyframes.size()>1 && t>(&tkf-1)->time)
 		tkf.prev = &tkf-1;
 
 	prepare_keyframe(tkf);
-- 
2.43.0