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-rw-r--r--indra/llprimitive/llmodel.cpp7
1 files changed, 5 insertions, 2 deletions
diff --git a/indra/llprimitive/llmodel.cpp b/indra/llprimitive/llmodel.cpp
index 29af859cd0..8fbb4f6b96 100644
--- a/indra/llprimitive/llmodel.cpp
+++ b/indra/llprimitive/llmodel.cpp
@@ -1034,8 +1034,11 @@ LLModel::weight_list& LLModel::getJointInfluences(const LLVector3& pos)
{ //no exact match found, get closest point
const F32 epsilon = 1e-5f;
weight_map::iterator iter_up = mSkinWeights.lower_bound(pos);
- weight_map::iterator iter_down = ++iter_up;
-
+ weight_map::iterator iter_down = iter_up;
+ if (iter_up != mSkinWeights.end())
+ {
+ iter_down = ++iter_up;
+ }
weight_map::iterator best = iter_up;
F32 min_dist = (iter->first - pos).magVec();