diff --git a/lib/Capsule.ts b/lib/Capsule.ts
index 1f9d604..92e6ccf 100644
--- a/lib/Capsule.ts
+++ b/lib/Capsule.ts
@@ -13,7 +13,7 @@ export interface ICapsule<T extends Captable = Captable> {
 }
 
 export function isCapsule(maybeCapsule: any): maybeCapsule is ICapsule {
-    return typeof maybeCapsule.val !== "undefined"
+    return maybeCapsule && typeof maybeCapsule.val !== "undefined"
         && typeof maybeCapsule.watch === "function"
         && typeof maybeCapsule.toString === "function";
 }
@@ -42,8 +42,8 @@ export default class Capsule<T extends Captable = Captable> implements ICapsule
         this.isString = typeof val === "string";
     }
 
-    static new<T extends Captable>(val: T | Capsule<T>): Capsule<T> {
-        if (val instanceof Capsule) {
+    static new<T extends Captable>(val: T | ICapsule<T>): ICapsule<T> {
+        if (isCapsule(val)) {
             return val;
         } else {
             return new Capsule<T>(val);
diff --git a/lib/Publisher.ts b/lib/Publisher.ts
index d40c4ab..b555300 100644
--- a/lib/Publisher.ts
+++ b/lib/Publisher.ts
@@ -1,4 +1,4 @@
-import ISubscriber, {LEvent} from "./Subscriber";
+import { ISubscriber, LEvent } from "./Subscriber";
 
 class PublisherSubscription<EventType extends LEvent> implements ISubscription {
     private subscriber: ISubscriber<EventType>;
diff --git a/package.json b/package.json
index 64fdee6..fc4621f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@djledda/ladder",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "other libraries provide you with a whole framework - this is just a ladder",
   "author": "Daniel Ledda <dan.j.ledda@gmail.com>",
   "license": "MIT",