I'm working with Community in EPiServer 7.5. I'm trying to add an image to a blog entry. This is the code

  stream.Position = 0;
                    // Create a image and set the presentation name of the user as name of image                                    
                    EPiServer.Community.ImageGallery.Image presentationImage =
                        new EPiServer.Community.ImageGallery.Image(entry.ImageGallery, FileName,
                            FileName, CurrentBlog.Author, stream);

                    // Add the image to the system
                    presentationImage = ImageGalleryHandler.Instance.AddImage(presentationImage);

                    // Set the image to presentation image
                    entry.SetAttributeValue(BlogAttributes.PresentationImage, presentationImage);

But it falls over at 

ImageGalleryHandler.Instance.AddImage(presentationImage);

with a null exception - it looks like the image gallery associated with the blog entry hasn't been created

Can anyone help please