diff --git a/ghost/sodo-search/src/search-index.js b/ghost/sodo-search/src/search-index.js
index ade0f0d043..b376cef836 100644
--- a/ghost/sodo-search/src/search-index.js
+++ b/ghost/sodo-search/src/search-index.js
@@ -11,6 +11,7 @@ export default class SearchIndex {
 
         this.postsIndex = null;
         this.authorsIndex = null;
+        this.tagsIndex = null;
 
         this.init = this.init.bind(this);
         this.search = this.search.bind(this);