diff --git a/indra/llmath/llvolume.cpp b/indra/llmath/llvolume.cpp
index 3c1de3a4229980fd733ae72df272da632efc7d9d..53f73d86377cc7182b44669a2323466620714a43 100644
--- a/indra/llmath/llvolume.cpp
+++ b/indra/llmath/llvolume.cpp
@@ -6010,6 +6010,11 @@ void LLVolumeFace::cacheOptimize()
 	
 	LLVCacheLRU cache;
 	
+	if (mNumVertices < 3)
+	{ //nothing to do
+		return;
+	}
+
 	//mapping of vertices to triangles and indices
 	std::vector<LLVCacheVertexData> vertex_data;