fixed search

1 files changed, 1 insertions, 1 deletions

diff --git a/src/client/util/SearchUtil.ts b/src/client/util/SearchUtil.ts
index 2f23d07dc..8077445f6 100644
--- a/src/client/util/SearchUtil.ts
+++ b/src/client/util/SearchUtil.ts
@@ -59,7 +59,7 @@ export namespace SearchUtil {
      * An array of all field names used by the Doc or its prototypes.
      */
     export function documentKeys(doc: Doc) {
-        return Object.keys(Doc.GetAllPrototypes(doc).filter(proto => proto).reduce(
+        return Array.from(Doc.GetAllPrototypes(doc).filter(proto => proto).reduce(
             (keys, proto) => {
                 Object.keys(proto).forEach(keys.add.bind(keys));
                 return keys;