diff --git a/src/events/001-base/baseEvent.js b/src/events/001-base/baseEvent.js
index 27c68177047cce538dc14b9b02a8b4b9605d12c5..67bab1f667c67612817c957eb387a9d51c1983ad 100644
--- a/src/events/001-base/baseEvent.js
+++ b/src/events/001-base/baseEvent.js
@@ -84,7 +84,7 @@ App.Events.BaseEvent = class BaseEvent {
 
 		for (; i < prereqs.length; ++i) {
 			const qualified = V.slaves.filter(s => !this.actors.includes(s.ID) && prereqs[i].every(p => p(s)));
-			if (qualified.empty) {
+			if (qualified.length === 0) {
 				return false; // a required actor was not found
 			}
 			this.actors.push(qualified.pluck().ID);