diff --git a/src/js/utilsMisc.js b/src/js/utilsMisc.js
index abc86130f81df4407d873296b478f25126b7f266..6454318fa06dfbd3fda99534494f15367b19ecc9 100644
--- a/src/js/utilsMisc.js
+++ b/src/js/utilsMisc.js
@@ -164,7 +164,7 @@ globalThis.asPlayer = function(human) {
  * @returns {App.Entity.SlaveState}
  */
 globalThis.asSlave = function(human) {
-	if (human.ID === -1) {
+	if (human && human.ID === -1) {
 		return null;
 	}
 	return /** @type {App.Entity.SlaveState} */(human);