gistfile1.diff

diff --git a/src/extras/loaders/ColladaLoader.js b/src/extras/loaders/ColladaLoader.js
index 18b1d98..a30aba7 100644
--- a/src/extras/loaders/ColladaLoader.js
+++ b/src/extras/loaders/ColladaLoader.js
@@ -1846,6 +1846,9 @@ THREE.ColladaLoader = function () {
                for ( i = 0; i < this.primitives.length; i ++ ) {
 
                        var primitive = this.primitives[ i ];
+                        if (primitive.count == 0) {
+                            continue;
+                        }
                        primitive.setVertices( this.vertices );
                        this.handlePrimitive( primitive, this.geometry3js, vertex_store );
 
diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index 0aee9d4..ba4af63 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -3863,6 +3863,9 @@ THREE.WebGLRenderer = function ( parameters ) {
                                for ( g in geometry.geometryGroups ) {
 
                                        geometryGroup = geometry.geometryGroups[ g ];
+                                        if (!geometryGroup.materialIndex) {
+                                            continue;
+                                        }
 
                                        // initialise VBO on the first access
 
@@ -4007,6 +4010,9 @@ THREE.WebGLRenderer = function ( parameters ) {
                                geometryGroup = geometry.geometryGroupsList[ i ];
 
                                material = getBufferMaterial( object, geometryGroup );
+                                if (!material) {
+                                    continue;
+                                }
 
                                customAttributesDirty = material.attributes && areCustomAttributesDirty( m
 
@@ -4028,6 +4034,9 @@ THREE.WebGLRenderer = function ( parameters ) {
                        geometry.__dirtyColors = false;
                        geometry.__dirtyTangents = false;
 
+                        if (!material) {
+                            return;
+                        }
                        material.attributes && clearCustomAttributes( material );
 
                } else if ( object instanceof THREE.Ribbon ) {