From 947e008fd3ad6584a39f82cf814333a91cf6e773 Mon Sep 17 00:00:00 2001
From: Heejae Chang <hechang@microsoft.com>
Date: Fri, 17 Jun 2016 13:59:55 -0700
Subject: [PATCH] prevent VS from crashing if VS got shutdown while build error
 reporting is in progress.

---
 .../SolutionCrawler/SolutionCrawlerRegistrationService.cs    | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Features/Core/Portable/SolutionCrawler/SolutionCrawlerRegistrationService.cs b/src/Features/Core/Portable/SolutionCrawler/SolutionCrawlerRegistrationService.cs
index 3e668c0a7d1a5..d3d89522bc543 100644
--- a/src/Features/Core/Portable/SolutionCrawler/SolutionCrawlerRegistrationService.cs
+++ b/src/Features/Core/Portable/SolutionCrawler/SolutionCrawlerRegistrationService.cs
@@ -91,7 +91,10 @@ public void Reanalyze(Workspace workspace, IIncrementalAnalyzer analyzer, IEnume
                 var coordinator = default(WorkCoordinator);
                 if (!_documentWorkCoordinatorMap.TryGetValue(workspace, out coordinator))
                 {
-                    throw new ArgumentException("workspace");
+                    // this can happen if solution crawler is already unregistered from workspace.
+                    // one of those example will be VS shutting down so roslyn package is disposed but there is a pending
+                    // async operation.
+                    return;
                 }
 
                 // no specific projects or documents provided