diff --git a/indra/llrender/llvertexbuffer.cpp b/indra/llrender/llvertexbuffer.cpp
index de4501dd0f76ea01aaac4bf56e3f2c1b2c9f867f..fd5136e58bf48a19ad1a7a810cca01e392d5af65 100644
--- a/indra/llrender/llvertexbuffer.cpp
+++ b/indra/llrender/llvertexbuffer.cpp
@@ -854,6 +854,8 @@ U8* LLVertexBuffer::mapBuffer(S32 access)
 
 		if (!mMappedData)
 		{
+			log_glerror();
+
 			//--------------------
 			//print out more debug info before crash
 			llinfos << "vertex buffer size: (num verts : num indices) = " << getNumVerts() << " : " << getNumIndices() << llendl ;
@@ -875,6 +877,8 @@ U8* LLVertexBuffer::mapBuffer(S32 access)
 
 		if (!mMappedIndexData)
 		{
+			log_glerror();
+
 			GLint buff;
 			glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING_ARB, &buff);
 			if ((GLuint)buff != mGLIndices)