I did not notice anything in your schematic or the snippet of code you provided that could obviously lead to this kind of behavior, and we have not heard of any issues from running Orangutan LCD code without an LCD attached. So, it seems like the issue could be from elsewhere in your program. Could you post your full code? To make your code more viewable on the forum, you can encapsulate it in a set of three back quotes (aka back ticks). You can also click the preformatted text icon in the reply editor, which I have highlighted (in dark gray) in the picture below:
You can also include your code as an attachment.
Additionally, our Orangutan LCD library does not have a function to check if the LCD is connected or not. You might be able to write your own code to detect the presence of the LCD, but it would require some lower-level understanding of the LCD interface.