Describe the bug
When I go on the webpage of Iris the screen is shown to me shortly, then there is a black screen.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Iris page on server'
2. Wait a few seconds

Expected behavior
Wabpage is shown all the time.

Environment details:

• OS: macOS 10.15.5 / iOS 13
• safari 13.1.1 and chrome 84
• Iris version 3.45.0 / 3.50.0

Additional context
Mopidy and Iris installed on a raspberry 3 b
Console output in browser:
app.min.js?v=1582232421:55 Error: Minified React error #31; visit https://reactjs.org/docs/error-decoder.html?invariant=31&args[]=SyntaxError%3A%20Unexpected%20end%20of%20JSON%20input&args[]= for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
at Di (app.min.js?v=1582232421:55)
at app.min.js?v=1582232421:55
at Wo (app.min.js?v=1582232421:55)
at xs (app.min.js?v=1582232421:55)
at Nl (app.min.js?v=1582232421:55)
at Pl (app.min.js?v=1582232421:55)
at El (app.min.js?v=1582232421:55)
at app.min.js?v=1582232421:55
at t.unstable_runWithPriority (app.min.js?v=1582232421:63)
at Ka (app.min.js?v=1582232421:55)
ys @ app.min.js?v=1582232421:55
Cs.n.callback @ app.min.js?v=1582232421:55
wi @ app.min.js?v=1582232421:55
ki @ app.min.js?v=1582232421:55
Ll @ app.min.js?v=1582232421:55
t.unstable_runWithPriority @ app.min.js?v=1582232421:63
Ka @ app.min.js?v=1582232421:55
Dl @ app.min.js?v=1582232421:55
El @ app.min.js?v=1582232421:55
(anonymous) @ app.min.js?v=1582232421:55
t.unstable_runWithPriority @ app.min.js?v=1582232421:63
Ka @ app.min.js?v=1582232421:55
Ja @ app.min.js?v=1582232421:55
Qa @ app.min.js?v=1582232421:55
yl @ app.min.js?v=1582232421:55
enqueueSetState @ app.min.js?v=1582232421:55
b.setState @ app.min.js?v=1582232421:47
(anonymous) @ app.min.js?v=1582232421:1
y @ app.min.js?v=1582232421:1
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
dispatch @ app.min.js?v=1582232421:1
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:71
dispatch @ app.min.js?v=1582232421:1
(anonymous) @ app.min.js?v=1582232421:1
Promise.then (async)
(anonymous) @ app.min.js?v=1582232421:1
c @ app.min.js?v=1582232421:1
(anonymous) @ app.min.js?v=1582232421:1
(anonymous) @ app.min.js?v=1582232421:71
(anonymous) @ app.min.js?v=1582232421:1
value @ app.min.js?v=1582232421:78
Ll @ app.min.js?v=1582232421:55
t.unstable_runWithPriority @ app.min.js?v=1582232421:63
Ka @ app.min.js?v=1582232421:55
Dl @ app.min.js?v=1582232421:55
El @ app.min.js?v=1582232421:55
yl @ app.min.js?v=1582232421:55
au @ app.min.js?v=1582232421:55
(anonymous) @ app.min.js?v=1582232421:55
wl @ app.min.js?v=1582232421:55
cu @ app.min.js?v=1582232421:55
render @ app.min.js?v=1582232421:55
(anonymous) @ app.min.js?v=1582232421:39
n @ app.min.js?v=1582232421:1
(anonymous) @ app.min.js?v=1582232421:1
(anonymous) @ app.min.js?v=1582232421:1
Show 6 more frames
app.min.js?v=1582232421:55 Uncaught (in promise) Error: Minified React error #31; visit https://reactjs.org/docs/error-decoder.html?invariant=31&args[]=SyntaxError%3A%20Unexpected%20end%20of%20JSON%20input&args[]= for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
at Di (app.min.js?v=1582232421:55)
at app.min.js?v=1582232421:55
at Wo (app.min.js?v=1582232421:55)
at xs (app.min.js?v=1582232421:55)
at Nl (app.min.js?v=1582232421:55)
at Pl (app.min.js?v=1582232421:55)
at El (app.min.js?v=1582232421:55)
at app.min.js?v=1582232421:55
at t.unstable_runWithPriority (app.min.js?v=1582232421:63)
at Ka (app.min.js?v=1582232421:55)