Bug 44200 - [Crash] ArgumentNullException happens in SendEvent
Summary: [Crash] ArgumentNullException happens in SendEvent
Status: RESOLVED FIXED
Alias: None
Product: Xamarin.Mac
Classification: Desktop
Component: Library (Xamarin.Mac.dll) ()
Version: 2.4.2 (C6SR3)
Hardware: Macintosh Windows
: --- normal
Target Milestone: ---
Assignee: Chris Hamons
URL:
Depends on:
Blocks:
 
Reported: 2016-09-12 16:51 UTC by Peng Zhou
Modified: 2016-09-14 15:33 UTC (History)
2 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED FIXED

Description Peng Zhou 2016-09-12 16:51:18 UTC
Customer reports an crash. The call stack is:

  at AppKit.NSResponder.ValidRequestorForSendType (System.String sendType, System.String returnType) <0x1223fe090 + 0x00190> in <filename unknown>:0 
  at Microsoft.AdvertisingDesktop.BingAdsEditor.DialogWindow.SendEvent (AppKit.NSEvent theEvent) <0x11f5b5b20 + 0x0002b> in <filename unknown>:0 
  at (wrapper managed-to-native) AppKit.NSApplication:NSApplicationMain (int,string[])
  at AppKit.NSApplication.Main (System.String[] args) <0x1100095c0 + 0x000c3> in <filename unknown>:0 
  at Microsoft.AdvertisingDesktop.BingAdsEditor.MainClass.Main (System.String[] args) <0x10a0bce40 + 0x00025> in <filename unknown>:0 

The error message shows:
Fault msg:
Value cannot be null.
Parameter name: returnType

According to the Apple documentation, the value could be null.

https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSResponder_Class/index.html#//apple_ref/occ/instm/NSResponder/validRequestorForSendType:returnType:

Discuss with Chris briefly and this could be an issue.
Comment 1 Chris Hamons 2016-09-14 15:33:40 UTC
https://github.com/xamarin/xamarin-macios/pull/832