Nightly

dist/preview release/babylon.max.js

@@ -44168,7 +44168,7 @@ var BABYLON;
             }
             if (!rd._cacheNode) {
                 // Check if we have to allocate a rendering zone in the global cache texture
-                var res = this.owner._allocateGroupCache(this, this.parent.renderGroup, curWidth ? new BABYLON.Size(curWidth, curHeight) : null, rd._useMipMap, rd._anisotropicLevel);
+                var res = this.owner._allocateGroupCache(this, this.parent && this.parent.renderGroup, curWidth ? new BABYLON.Size(curWidth, curHeight) : null, rd._useMipMap, rd._anisotropicLevel);
                 rd._cacheNode = res.node;
                 rd._cacheTexture = res.texture;
                 rd._cacheRenderSprite = res.sprite;

src/Canvas2d/babylon.group2d.js

@@ -671,7 +671,7 @@ var BABYLON;
             }
             if (!rd._cacheNode) {
                 // Check if we have to allocate a rendering zone in the global cache texture
-                var res = this.owner._allocateGroupCache(this, this.parent.renderGroup, curWidth ? new BABYLON.Size(curWidth, curHeight) : null, rd._useMipMap, rd._anisotropicLevel);
+                var res = this.owner._allocateGroupCache(this, this.parent && this.parent.renderGroup, curWidth ? new BABYLON.Size(curWidth, curHeight) : null, rd._useMipMap, rd._anisotropicLevel);
                 rd._cacheNode = res.node;
                 rd._cacheTexture = res.texture;
                 rd._cacheRenderSprite = res.sprite;