diff --git a/spec/PKPass.ts b/spec/PKPass.ts
index d66491f..d9999e2 100644
--- a/spec/PKPass.ts
+++ b/spec/PKPass.ts
@@ -32,6 +32,18 @@ describe("PKPass", () => {
 		);
 	});
 
+	describe("constructor", () => {
+		it("should warn about a non-object buffer parameter", () => {
+			console.warn = jasmine.createSpy("warn");
+
+			pass = new PKPass(undefined, baseCerts);
+
+			expect(console.warn).toHaveBeenCalledWith(
+				Messages.INIT.INVALID_BUFFERS.replace("%s", "undefined"),
+			);
+		});
+	});
+
 	describe("setBeacons", () => {
 		it("should reset instance.props['beacons'] if 'null' is passed as value", () => {
 			pass.setBeacons({
diff --git a/src/PKPass.ts b/src/PKPass.ts
index 498d71a..8cc9ca7 100644
--- a/src/PKPass.ts
+++ b/src/PKPass.ts
@@ -130,15 +130,21 @@ export default class PKPass extends Bundle {
 	) {
 		super("application/vnd.apple.pkpass");
 
-		const buffersEntries = Object.entries(buffers);
+		if (buffers && typeof buffers === "object") {
+			const buffersEntries = Object.entries(buffers);
 
-		for (
-			let i = buffersEntries.length, buffer: [string, Buffer];
-			(buffer = buffersEntries[--i]);
+			for (
+				let i = buffersEntries.length, buffer: [string, Buffer];
+				(buffer = buffersEntries[--i]);
 
-		) {
-			const [fileName, contentBuffer] = buffer;
-			this.addBuffer(fileName, contentBuffer);
+			) {
+				const [fileName, contentBuffer] = buffer;
+				this.addBuffer(fileName, contentBuffer);
+			}
+		} else {
+			console.warn(
+				Messages.format(Messages.INIT.INVALID_BUFFERS, typeof buffers),
+			);
 		}
 
 		if (props) {
diff --git a/src/messages.ts b/src/messages.ts
index faf956c..dd8ca5d 100644
--- a/src/messages.ts
+++ b/src/messages.ts
@@ -1,3 +1,8 @@
+export const INIT = {
+	INVALID_BUFFERS:
+		"Cannot set buffers in constructor: expected object but received %s",
+} as const;
+
 export const CERTIFICATES = {
 	INVALID:
 		"Invalid certificate(s) loaded. %s. Please provide valid WWDR certificates and developer signer certificate and key (with passphrase).\nRefer to docs to obtain them",