1 files changed, 5 insertions, 3 deletions
diff --git a/src/client/DocServer.ts b/src/client/DocServer.ts
index 5fdea131b..fc8a9f3d6 100644
--- a/src/client/DocServer.ts
+++ b/src/client/DocServer.ts
@@ -32,9 +32,11 @@ export namespace DocServer {
     let _cache: { [id: string]: RefField | Promise<Opt<RefField>> } = {};
 
     export function FindDocByTitle(title: string) {
-        const foundDocId = Array.from(Object.keys(_cache))
-            .filter(key => _cache[key] instanceof Doc)
-            .find(key => (_cache[key] as Doc).title === title);
+        const foundDocId =
+            title &&
+            Array.from(Object.keys(_cache))
+                .filter(key => _cache[key] instanceof Doc)
+                .find(key => (_cache[key] as Doc).title === title);
 
         return foundDocId ? (_cache[foundDocId] as Doc) : undefined;
     }