Add-in forces OWA reload in Edge only

We are working on an Outlook office.js add-in. It works in Outlook for Windows and Mac, and OWA for Firefox, Chrome, Safari and IE (with some separate issues with Safari and IE) but OWA Edge is crashing OWA just by loading a task pane triggered by an add-in command. By crash what I mean is it successfully loads the task pane, and then the UI freezes for about 5-10 seconds, then OWA reloads itself.

When this happens an error appears in the event log:

Faulting application name: MicrosoftEdgeCP.exe, version: 11.0.15063.483, time stamp: 0x595f2577
Faulting module name: RPCRT4.dll, version: 10.0.15063.0, time stamp: 0xcf94c546
Exception code: 0xc00000fd
Fault offset: 0x000000000001539b
Faulting process id: 0x176c
Faulting application start time: 0x01d315f28d6ef0f7
Faulting application path: C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
Faulting module path: C:\WINDOWS\System32\RPCRT4.dll
Report Id: b6162eec-9330-4481-a33c-b6d4411d9a43
Faulting package full name: Microsoft.MicrosoftEdge_40.15063.0.0_neutral__8wekyb3d8bbwe
Faulting package-relative application ID: ContentProcess

Some details:

1. Some users have no crashes
2. Others crash on every task pane
3. One user only crashed on task panes when an asynchronous operation was triggered.

We are at a loss on how to proceed in looking into this issue. Does anyone have any ideas?

Update: It turned out to be some code we wrote that Edge does not like. Thanks.