SAP Knowledge Base Article - Public

2357760 - Crash in Silverlight UI when Using Firefox Browser


You are getting silverlight crash or exception when accessing reports or performing some tasks in silverlight client.

Reproducing the Issue

  1. Login into Silverlight using Firefox.
  2. Go to the any work center.
  3. Click on Report List.

You get front-end exception or silverlight crash.

Exception: System. NullReferenceException: [Arg_NullReferenceException]
or System.FormatException: [Format_InvalidSrting].

You may get such exception by performing other tasks like creation of Puchase Orders , accessing Project Time Approvals etc.


With new Firefox version greater than 40.0 or above, there is some changes made which Silverlight is unable to handle. Due to this, exception is triggered. There is no solution from Firefox or Microsoft.


Mozilla Firefox is currently not supported on Silverlight UI. Please refer System Requirements document using below link.


Incase if Internet explorer is not available, as a workaround you can use lower version of Firefox (below 40.0) or use a lower  Firefox ESR Version



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