[REACT] TypeError: Cannot read properties of null (reading 'hasLinks')

[andrew.perera]

Hi Team,
As you might already be aware we use the two scheduler view and React as the front-end development library.
We have upgraded Bryntum from 5.0.1 to 5.2.2 and ever since we get TypeError: Cannot read properties of null (reading 'hasLinks') when moving the first event from the top grid to the bottom grid.

Here are the steps.

1. Drag and drop an event from the top grid to the bottom grid (No events in the bottom grid)

   

   start.png (59.96 KiB) Viewed 156 times

2. The whole scheduler goes to frozen mode. the event is not visible anymore where you dropped. Unless you do a full refresh the screen will remain the same.

   

   freeze.png (54.73 KiB) Viewed 156 times

3. Check the console and found the error as follows

   

   consoleerror.png (48.39 KiB) Viewed 156 times

4. I debugged the code in both 5.0.1 & 5.2.2 using the scheduler.umd.js

As you can see our scheduler worked fine when the version was 5.0.1. Please provide your assistance.

[andrew.perera]

Please find the debugged Bryntum code

5.0.1code.png (48.48 KiB) Viewed 154 times

5.2.2code.png (44.34 KiB) Viewed 154 times

[alex.l]

Hi andrew.perera,

Thanks for the screenshots. Looks like resource is not exists in the assignment model instance.
It's hard to say what exactly happened here without a test case.
Please attach a runnable code here with data example and steps to reproduce this problem.

[netten.mehra]

Hey
I had the same issue after updating from v4 to v5. I it by passing the event/eventAssignment information only to the scheduler as soon as the resources have loaded.

After the resources array is filled, I also pass the events. Maybe this could help. It worked before in v4 and only emerged after my v5 migration. Hope this helps

[alex.l]

Did you follow instructions in our Upgrade guides one by one for all versions via 4.x and 5.x? https://bryntum.com/products/schedulerpro/docs/api/guides-upgrading

[andrew.perera]

Hi Alex, Thanks for your response.

I think it is reproducible in your code

1. Pass an empty array for events for Scheduler 2 instance - This represents the bottom scheduler without any event

   

   emptyarray.png (70.06 KiB) Viewed 119 times

   

   schedulernoevents.png (97.71 KiB) Viewed 119 times

2 . Drag and drop the event from the top grid to the bottom grid and observe the console

errorproduced.png (165.12 KiB) Viewed 119 times

1. App freezes and if you move the mouse cursor on top timelines and scrolling will move fast weirdly.

Cheers.

[jasony]

Hey folks,

We've also been running into this issue lately. It looks like you have a working reproduction of the problem but if its any help it looks like this was introduced somewhere between version 5.0.6 and 5.2.0.

Thanks!

[alex.l]

Hi andrew.perera,

Thank you for clear instructions! I've reproduced that and confirmed a bug. Here is a ticket to track the status: https://github.com/bryntum/support/issues/6094

@jasony thank for your information!