From 522e8e67753de4685e2a23cc3108457cb0626ed4 Mon Sep 17 00:00:00 2001
From: BoykoAlex <aboyko@pivotal.io>
Date: Wed, 11 Oct 2017 00:57:57 -0400
Subject: [PATCH] Fix NPE for Atom LS build

---
 .../ide/vscode/boot/java/utils/SpringIndexer.java             | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/headless-services/boot-java-language-server/src/main/java/org/springframework/ide/vscode/boot/java/utils/SpringIndexer.java b/headless-services/boot-java-language-server/src/main/java/org/springframework/ide/vscode/boot/java/utils/SpringIndexer.java
index 4427537c2..7c58b34c4 100644
--- a/headless-services/boot-java-language-server/src/main/java/org/springframework/ide/vscode/boot/java/utils/SpringIndexer.java
+++ b/headless-services/boot-java-language-server/src/main/java/org/springframework/ide/vscode/boot/java/utils/SpringIndexer.java
@@ -214,7 +214,9 @@ public class SpringIndexer {
 
 		if (cu != null) {
 			List<SymbolInformation> oldSymbols = symbolsByDoc.remove(docURI);
-			symbols.removeAll(oldSymbols);
+			if (oldSymbols != null) {
+				symbols.removeAll(oldSymbols);
+			}
 
 			AtomicReference<TextDocument> docRef = new AtomicReference<>();
 			scanAST(cu, docURI, docRef, content);