From 1f83953da4130af2d4c33303ae462bda396185df Mon Sep 17 00:00:00 2001
From: AlexVinS <alexvins@mail.ru>
Date: Sun, 10 Feb 2019 21:09:24 +0300
Subject: [PATCH] Partial fix for https://bugs.vcmi.eu/view.php?id=3033

---
 AI/VCAI/Goals/VisitObj.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/AI/VCAI/Goals/VisitObj.cpp b/AI/VCAI/Goals/VisitObj.cpp
index 33e69325b..9fa030e1c 100644
--- a/AI/VCAI/Goals/VisitObj.cpp
+++ b/AI/VCAI/Goals/VisitObj.cpp
@@ -90,10 +90,16 @@ TSubgoal VisitObj::whatToDoToAchieve()
 	return bestGoal;
 }
 
-VisitObj::VisitObj(int Objid) : CGoal(VISIT_OBJ)
+VisitObj::VisitObj(int Objid)
+	: CGoal(VISIT_OBJ)
 {
 	objid = Objid;
-	tile = ai->myCb->getObjInstance(ObjectInstanceID(objid))->visitablePos();
+	auto obj = ai->myCb->getObjInstance(ObjectInstanceID(objid));
+	if(obj)
+		tile = obj->visitablePos();
+	else
+		logAi->error("VisitObj constructed with invalid object instance %d", Objid);
+
 	priority = 3;
 }