From 8ed74a342988b7d67a7c9eacc2257ba42acd00de Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Mon, 9 Apr 2012 23:06:24 +0300
Subject: [PATCH] Fix ABM handling on block activation

---
 src/environment.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/environment.cpp b/src/environment.cpp
index e1f5bb3f..43dbb65d 100644
--- a/src/environment.cpp
+++ b/src/environment.cpp
@@ -633,13 +633,15 @@ public:
 				i->timer -= trigger_interval;
 				actual_interval = trigger_interval;
 			}
-			ActiveABM aabm;
-			aabm.abm = abm;
 			float intervals = actual_interval / trigger_interval;
+			if(intervals == 0)
+				continue;
 			float chance = abm->getTriggerChance();
 			if(chance == 0)
 				chance = 1;
-			aabm.chance = 1.0 / pow((float)1.0/chance, (float)intervals);
+			ActiveABM aabm;
+			aabm.abm = abm;
+			aabm.chance = chance / intervals;
 			if(aabm.chance == 0)
 				aabm.chance = 1;
 			// Trigger neighbors