I don't really know how to fix that cause I did not run into that problem.
but I can offer suggestions
A: turn off the external modules and if theres a text box that appears. Everytime it appears erase everything inside the text box everytime it appears and press okay.
B: maybe u have an outdated joiplay app try updating?
C: try fiddling with the settings and see if it works.
D: Is your NWJSAPI on? Its on the settings.
E: Maybe try turning the external modules off and on?
Now I'm fairly confident its the "external modules" because that happened before I turned on my "allow external modules" and it always happens whenever you dont erase everything on every single textbox.
Does it crash when it goes black? If it does thats the problem. If it is just refer to A or E.
Now if all of those doesnt work then Idk and Im sorry cause again, Im not a modder and my technical skills are limited to dragging and dropping files.