From c88335d46be5afa1a13386881bbe58900f1089d6 Mon Sep 17 00:00:00 2001
From: Sean McManus <seanmcm@microsoft.com>
Date: Wed, 28 Nov 2018 12:13:03 -0800
Subject: [PATCH] Protect against no activeDocument.

---
 Extension/src/LanguageServer/clientCollection.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Extension/src/LanguageServer/clientCollection.ts b/Extension/src/LanguageServer/clientCollection.ts
index 76e9f368e..e14ad626d 100644
--- a/Extension/src/LanguageServer/clientCollection.ts
+++ b/Extension/src/LanguageServer/clientCollection.ts
@@ -119,7 +119,7 @@ export class ClientCollection {
                 this.languageClients.set(key, cpptools.createNullClient());
             }
 
-            if (this.activeClient === client) {
+            if (this.activeClient === client && this.activeDocument) {
                 this.activeClient = this.getClientFor(this.activeDocument.uri);
                 this.activeClient.activeDocumentChanged(this.activeDocument);
             }
@@ -154,7 +154,7 @@ export class ClientCollection {
                     client.TrackedDocuments.forEach(document => this.transferOwnership(document, client));
                     client.TrackedDocuments.clear();
 
-                    if (this.activeClient === client) {
+                    if (this.activeClient === client && this.activeDocument) {
                         // Need to make a different client the active client.
                         this.activeClient = this.getClientFor(this.activeDocument.uri);
                         this.activeClient.activeDocumentChanged(this.activeDocument);