When the chat room contains a message from a user who has not selected an avatar image, the header of that message tries to display that user's avatar anyway, which ends up showing as the "image failed to load" icon. (Instead of a JPEG or PNG image, it returns the string "The user avatar does not exist!".) I would expect to see some sort of placeholder (either a static "no-avatar-defined" image or something randomly generated, like Gravatar's "wavatars").
When the chat room contains a message from a user who has not selected an avatar image, the header of that message tries to display that user's avatar anyway, which ends up showing as the "image failed to load" icon. (Instead of a JPEG or PNG image, it returns the string "The user avatar does not exist!".) I would expect to see some sort of placeholder (either a static "no-avatar-defined" image or something randomly generated, like Gravatar's "wavatars").