diff --git a/pymodbus/framer/old_framer_base.py b/pymodbus/framer/old_framer_base.py
index b35da6d53..4922be1c4 100644
--- a/pymodbus/framer/old_framer_base.py
+++ b/pymodbus/framer/old_framer_base.py
@@ -138,6 +138,8 @@ def processIncomingPacket(self, data, callback, slave, **kwargs):
         """
         Log.debug("Processing: {}", data, ":hex")
         self._buffer += data
+        if self._buffer == b'':
+            return
         if not isinstance(slave, (list, tuple)):
             slave = [slave]
         single = kwargs.pop("single", False)
diff --git a/pymodbus/framer/old_framer_socket.py b/pymodbus/framer/old_framer_socket.py
index 4bd36f3f7..bc515ab2a 100644
--- a/pymodbus/framer/old_framer_socket.py
+++ b/pymodbus/framer/old_framer_socket.py
@@ -72,6 +72,8 @@ def frameProcessIncomingPacket(self, single, callback, slave, tid=None, **kwargs
         function to process and send.
         """
         while True:
+            if self._buffer == b'':
+                return
             used_len, use_tid, dev_id, data = self.message_handler.decode(self._buffer)
             if not data:
                 return