From fa988eacbdf9f17e6ef415db929efa2be650210f Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Thu, 7 Dec 2017 12:33:40 -0800
Subject: [PATCH] Fixes #20475 (no repro found yet)

---
 src/services/symbolDisplay.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/services/symbolDisplay.ts b/src/services/symbolDisplay.ts
index fe04342b8f7..caf38306bec 100644
--- a/src/services/symbolDisplay.ts
+++ b/src/services/symbolDisplay.ts
@@ -496,7 +496,7 @@ namespace ts.SymbolDisplay {
             addNewLineIfDisplayPartsExist();
             if (symbolKind) {
                 pushTypePart(symbolKind);
-                if (!some(symbol.declarations, d => isArrowFunction(d) || (isFunctionExpression(d) || isClassExpression(d)) && !d.name)) {
+                if (symbol && !some(symbol.declarations, d => isArrowFunction(d) || (isFunctionExpression(d) || isClassExpression(d)) && !d.name)) {
                     displayParts.push(spacePart());
                     addFullSymbolName(symbol);
                 }