diff --git a/nodes/core/core/89-delay.js b/nodes/core/core/89-delay.js
index dfc5616ae..f29852450 100644
--- a/nodes/core/core/89-delay.js
+++ b/nodes/core/core/89-delay.js
@@ -84,7 +84,7 @@ module.exports = function(RED) {
         this.buffer = [];
         this.intervalID = -1;
         this.randomID = -1;
-        this.lastSent;
+        this.lastSent = null;
         this.drop = n.drop;
         var node = this;