3 files changed, 38 insertions, 15 deletions

diff --git a/indra/newview/llviewerobject.cpp b/indra/newview/llviewerobject.cpp
index e590f29a9a..cd300accb7 100644
--- a/indra/newview/llviewerobject.cpp
+++ b/indra/newview/llviewerobject.cpp
@@ -877,6 +877,13 @@ U32 LLViewerObject::processUpdateMessage(LLMessageSystem *mesgsys,
 	LLMemType mt(LLMemType::MTYPE_OBJECT);
 	U32 retval = 0x0;
 	
+	// If region is removed from the list it is also deleted.
+	if (!LLWorld::instance().isRegionListed(mRegionp))
+	{
+		llwarns << "Updating object in an invalid region" << llendl;
+		return retval;
+	}
+
 	// Coordinates of objects on simulators are region-local.
 	U64 region_handle;
 	mesgsys->getU64Fast(_PREHASH_RegionData, _PREHASH_RegionHandle, region_handle);
@@ -3478,7 +3485,8 @@ LLNameValue *LLViewerObject::getNVPair(const std::string& name) const
 
 void LLViewerObject::updatePositionCaches() const
 {
-	if(mRegionp)
+	// If region is removed from the list it is also deleted.
+	if(mRegionp && LLWorld::instance().isRegionListed(mRegionp))
 	{
 		if (!isRoot())
 		{
@@ -3495,7 +3503,8 @@ void LLViewerObject::updatePositionCaches() const
 
 const LLVector3d LLViewerObject::getPositionGlobal() const
 {	
-	if(mRegionp)
+	// If region is removed from the list it is also deleted.
+	if(mRegionp && LLWorld::instance().isRegionListed(mRegionp))
 	{
 		LLVector3d position_global = mRegionp->getPosGlobalFromRegion(getPositionRegion());
 
@@ -3514,7 +3523,8 @@ const LLVector3d LLViewerObject::getPositionGlobal() const
 
 const LLVector3 &LLViewerObject::getPositionAgent() const
 {
-	if (mRegionp)
+	// If region is removed from the list it is also deleted.
+	if(mRegionp && LLWorld::instance().isRegionListed(mRegionp))
 	{
 		if (mDrawable.notNull() && (!mDrawable->isRoot() && getParent()))
 		{
diff --git a/indra/newview/llworld.cpp b/indra/newview/llworld.cpp
index fbd8b3ada3..3d971e738e 100644
--- a/indra/newview/llworld.cpp
+++ b/indra/newview/llworld.cpp
@@ -1188,20 +1188,23 @@ void LLWorld::getAvatars(uuid_vec_t* avatar_ids, std::vector<LLVector3d>* positi
 		iter != LLCharacter::sInstances.end(); ++iter)
 	{
 		LLVOAvatar* pVOAvatar = (LLVOAvatar*) *iter;
-		LLVector3d pos_global = pVOAvatar->getPositionGlobal();
-		LLUUID uuid = pVOAvatar->getID();
-		if( !pVOAvatar->isDead()
-			&& !pVOAvatar->isSelf()
-			&& !uuid.isNull() &&
-			dist_vec_squared(pos_global, relative_to) <= radius_squared)
+
+		if (!pVOAvatar->isDead() && !pVOAvatar->isSelf())
 		{
-			if(positions != NULL)
-			{
-				positions->push_back(pos_global);
-			}
-			if(avatar_ids !=NULL)
+			LLVector3d pos_global = pVOAvatar->getPositionGlobal();
+			LLUUID uuid = pVOAvatar->getID();
+
+			if (!uuid.isNull()
+				&& dist_vec_squared(pos_global, relative_to) <= radius_squared)
 			{
-				avatar_ids->push_back(uuid);
+				if(positions != NULL)
+				{
+					positions->push_back(pos_global);
+				}
+				if(avatar_ids !=NULL)
+				{
+					avatar_ids->push_back(uuid);
+				}
 			}
 		}
 	}
@@ -1232,6 +1235,11 @@ void LLWorld::getAvatars(uuid_vec_t* avatar_ids, std::vector<LLVector3d>* positi
 	}
 }
 
+bool LLWorld::isRegionListed(const LLViewerRegion* region) const
+{
+	region_list_t::const_iterator it = find(mRegionList.begin(), mRegionList.end(), region);
+	return it != mRegionList.end();
+}
 
 LLHTTPRegistration<LLEstablishAgentCommunication>
 	gHTTPRegistrationEstablishAgentCommunication(
diff --git a/indra/newview/llworld.h b/indra/newview/llworld.h
index d8ab4bc508..f350009d10 100644
--- a/indra/newview/llworld.h
+++ b/indra/newview/llworld.h
@@ -157,6 +157,11 @@ public:
 		std::vector<LLVector3d>* positions = NULL, 
 		const LLVector3d& relative_to = LLVector3d(), F32 radius = FLT_MAX) const;
 
+	// Returns 'true' if the region is in mRegionList,
+	// 'false' if the region has been removed due to region change
+	// or if the circuit to this simulator had been lost.
+	bool isRegionListed(const LLViewerRegion* region) const;
+
 private:
 	region_list_t	mActiveRegionList;
 	region_list_t	mRegionList;