OpenGL debug message: id=131204, source=API, type=OTHER, severity=LOW, message='Texture state usage warning: The texture object (0) bound to texture image unit 1 does not have a defined base level and cannot be used for texture mapping.'
 
This debug message seems to be caused by the beam of end crystals on ender dragons.
Note: I don't know how to get a stacktrace of the message.