diff --git a/src/WAConnection/4.Events.ts b/src/WAConnection/4.Events.ts
index 1310b8a..7ce9bb9 100644
--- a/src/WAConnection/4.Events.ts
+++ b/src/WAConnection/4.Events.ts
@@ -351,6 +351,7 @@ export class WAConnection extends Base {
 
         // blocklist updates
         this.on('CB:Blocklist', json => {
+            if (!json) return
             json = json[1]
             const initial = this.blocklist
             this.blocklist = json.blocklist