diff --git a/adafruit_minimqtt/adafruit_minimqtt.py b/adafruit_minimqtt/adafruit_minimqtt.py
index d654fd7..6387678 100644
--- a/adafruit_minimqtt/adafruit_minimqtt.py
+++ b/adafruit_minimqtt/adafruit_minimqtt.py
@@ -896,7 +896,7 @@ def _wait_for_msg(self, timeout=0.1):
 
         # Block while we parse the rest of the response
         self._sock.settimeout(timeout)
-        if res in [None, b""]:
+        if res in [None, b"", bytearray(b'\x00')]:
             # If we get here, it means that there is nothing to be received
             return None
         if res[0] == MQTT_PINGRESP: