From a151a2985d2fd7b98b63eeb8306b7a67ffa4a194 Mon Sep 17 00:00:00 2001
From: Petr Baudis <pasky@ucw.cz>
Date: Sun, 27 Nov 2011 04:42:52 +0100
Subject: [PATCH] agent::on_tick(): Do nothing when not placed

---
 agent.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/agent.cc b/agent.cc
index 6107e2a..e7446a6 100644
--- a/agent.cc
+++ b/agent.cc
@@ -106,6 +106,9 @@ agent::on_action_takes(void)
 void
 agent::on_tick(void)
 {
+	if (!tile)
+		return;
+
 	if (!dead) {
 		chenergy(world::sun_energy);