Today I finally solved a problem that I have been trying to hunt down for a long time. I haven’t been able to find any good help on this elsewhere, so let me share how I solved it.
This is my setup: I have SharePoint Online site, where I open a modal window to load a page from a provider hosted app (Add-In). The app is running in Azure Websites (Web Apps). The page is built with ASP.Net WebForms and displays a simple form that you submit back to the app.
SCRIPT5007: Unable to get property 'PRM_ParserErrorDetails' of undefined or null reference
File: MicrosoftAjaxWebForms.debug.js, Line: 1432, Column: 13
Other browsers worked fine though. The solution was stupid simple, but easy to miss:
The Azure site need to be added as a trusted site in Internet Explorer!
For the curious: The postback never seemed to make it back to the server. Actually it did, but it got stuck in the Page_PreInit() mehod, where SharePointContextProvider.CheckRedirectionStatus() returned a “RedirectionStatus.CanNotRedirect” and the the connection ends.