From 77883aef4bb8531c83bdeac45a5463a76e1158d7 Mon Sep 17 00:00:00 2001
From: thickbrick
Date: Sun, 16 Jan 2011 02:03:16 +0200
Subject: Fix #756: Link button in build floater can crash

Prevent null dereference when the selection has no primary object,
e.g. rubber band selection.
---
 linden/indra/newview/llfloatertools.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/linden/indra/newview/llfloatertools.cpp b/linden/indra/newview/llfloatertools.cpp
index 683ebd4..cc205ee 100644
--- a/linden/indra/newview/llfloatertools.cpp
+++ b/linden/indra/newview/llfloatertools.cpp
@@ -1256,7 +1256,8 @@ void LLFloaterTools::onClickLink(void* data)
 	}
 
 	S32 max_linked_prims = 0;
-	if(LLSelectMgr::getInstance()->getSelection()->getPrimaryObject()->usePhysics())
+	LLViewerObject* first_rootp = LLSelectMgr::getInstance()->getSelection()->getFirstRootObject();
+	if(first_rootp && first_rootp->usePhysics())
 	{
 		//Physical - use phys prim limit
 		max_linked_prims = gHippoLimits->getMaxPhysLinkedPrims();
-- 
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