Empty calendar causes blank screen error on return to free status

[mnordstr]

Hi,

We have a single meeting room calendar on the display and everything seems to work ok. When a meeting is in progress and the screen shows busy and when the meeting is over and the screen should return to open (green) the screen goes blank and looking at the console I see the following error:

TypeError: Cannot read property 'Subject' of undefined at s (main.d06b06f7.js:1) at beginWork (main.d06b06f7.js:1) at i (main.d06b06f7.js:1) at c (main.d06b06f7.js:1) at l (main.d06b06f7.js:1) at m (main.d06b06f7.js:1) at h (main.d06b06f7.js:1) at Object.enqueueSetState (main.d06b06f7.js:1) at t.o.setState (main.d06b06f7.js:1) at Object.n.handleSocket [as response] (main.d06b06f7.js:1) p @ main.d06b06f7.js:1 main.d06b06f7.js:1 Uncaught TypeError: Cannot read property 'Subject' of undefined at s (main.d06b06f7.js:1) at beginWork (main.d06b06f7.js:1) at i (main.d06b06f7.js:1) at c (main.d06b06f7.js:1) at l (main.d06b06f7.js:1) at m (main.d06b06f7.js:1) at h (main.d06b06f7.js:1) at Object.enqueueSetState (main.d06b06f7.js:1) at t.o.setState (main.d06b06f7.js:1) at Object.n.handleSocket [as response] (main.d06b06f7.js:1)

There are no upcoming appointments so this seems to be the issue. When I create two upcoming meetings, the first one works correctly and the second one has the same issue returning to open, goes blank as there are no upcoming appointments.

[DanySupernova]

I have same issue, how did you solve it?

Thank you very much!

[DanySupernova]

I installed version 0.3.3 and it works, I don't know why. I have 2013 on prem

[mnordstr]

I have same issue, how did you solve it?

Thank you very much!

Hi, never managed to solve it. We refresh the whole page quite often (show other things on the display also) so the error will not show up for long normally.

[FlamingFlamingo42]

Is there any fix to that? Still having this problem in the newest version.

To reproduce:
Simple create an Event starting before current time and ending in the future. After the Singleroom screen changes to red, cancel the event.

[FlamingFlamingo42]

I found a fix.
In RoomStatusBlock.js the check for details.appointmentsExists doesn't work as intended.
Simply changing to details.appointmentsExists && room.Appointments.length > 0 fixed the problem for me.

Here is the whole class:
https://pastebin.com/bxTrH4zJ