diff --git a/src/radius/handler/UserPasswordPacketHandler.ts b/src/radius/handler/UserPasswordPacketHandler.ts
index e7d4835..9abb4d2 100644
--- a/src/radius/handler/UserPasswordPacketHandler.ts
+++ b/src/radius/handler/UserPasswordPacketHandler.ts
@@ -16,7 +16,7 @@ export class UserPasswordPacketHandler implements IPacketHandler {
 		const username = packet.attributes['User-Name'];
 		let password = packet.attributes['User-Password'];
 
-		if (typeof password !== 'string' && password.indexOf(0x00) > 0) {
+		if (Buffer.isBuffer(password) && password.indexOf(0x00) > 0) {
 			// check if there is a 0x00 in it, and trim it from there
 			password = password.slice(0, password.indexOf(0x00));
 		}