From e81e116b89fad0f3fcfb76039b0b802073307478 Mon Sep 17 00:00:00 2001
From: bob <bcz@cs.brown.edu>
Date: Thu, 13 Jun 2019 11:50:52 -0400
Subject: tweaked link following

---
 src/new_fields/Doc.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/new_fields/Doc.ts')

diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index 7e02a5bc5..c2cfda079 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -186,7 +186,8 @@ export namespace Doc {
     }
 
     // compare whether documents or their protos match
-    export function AreProtosEqual(doc: Doc, other: Doc) {
+    export function AreProtosEqual(doc?: Doc, other?: Doc) {
+        if (!doc || !other) return false;
         let r = (doc === other);
         let r2 = (doc.proto === other);
         let r3 = (other.proto === doc);
-- 
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