diff --git a/lib/plugins/treatmentnotify.js b/lib/plugins/treatmentnotify.js
index 5a71e05cb28..32143e5ec93 100644
--- a/lib/plugins/treatmentnotify.js
+++ b/lib/plugins/treatmentnotify.js
@@ -101,9 +101,11 @@ function init() {
 }
 
 function isCurrent(last) {
+  if (!last) return false;
+
   var now = Date.now();
-  var lastTime = last ? last.mills : 0;
-  var ago = (lastTime && lastTime <= now) ? now - lastTime : -1;
+  var lastTime = last.mills;
+  var ago = (last.mills <= now) ? now - lastTime : -1;
   return ago !== -1 && ago < times.mins(10).msecs;
 }