diff --git a/kasa/transports/sslaestransport.py b/kasa/transports/sslaestransport.py
index e474edc2..4d3df62e 100644
--- a/kasa/transports/sslaestransport.py
+++ b/kasa/transports/sslaestransport.py
@@ -609,6 +609,8 @@ class SslAesTransport(BaseTransport):
                 _sha256_hash32,
                 lambda x: x.decode(),
             }:
+                if not val:
+                    continue
                 pwd_hash = func(val.encode())
                 ec = self.generate_confirm_hash(local_nonce, server_nonce, pwd_hash)
                 if device_confirm == ec: