diff --git a/lib/modules/database.js b/lib/modules/database.js
index b42b9f8..3f5c23e 100644
--- a/lib/modules/database.js
+++ b/lib/modules/database.js
@@ -215,7 +215,7 @@ class DatabaseRef extends ReferenceBase {
     const path = this.dbPath();
     return this.db.off(path, evt, origCB)
       .then(({callback, subscriptions}) => {
-        if (dbSubscriptions[path][evt].length > 0) {
+        if (dbSubscriptions[path] && dbSubscriptions[path][evt].length > 0) {
           return subscriptions;
         }