diff --git a/index.js b/index.js
index c48660ea0f74f3d61c2ab8d57f139f7c115e91de..651b5a7d30656c8f41291b3a978b0b5f0a7ad62f 100644
--- a/index.js
+++ b/index.js
@@ -50,7 +50,11 @@ export default class PCancelable {
 
 			const onCancel = handler => {
 				if (this.#state !== promiseState.pending) {
-					throw new Error(`The \`onCancel\` handler was attached after the promise ${this.#state.description}.`);
+					console.error(
+						`The \`onCancel\` handler was attached after the promise ${this.#state.description}.`,
+					);
+
+					return;
 				}
 
 				this.#cancelHandlers.push(handler);