diff --git a/jerry-debugger/jerry-client-ws.py b/jerry-debugger/jerry-client-ws.py
index 9c5af02137..b43ec4fd76 100755
--- a/jerry-debugger/jerry-client-ws.py
+++ b/jerry-debugger/jerry-client-ws.py
@@ -316,6 +316,8 @@ def __init__(self, address):
 
         if len_result > len_expected:
             result = result[len_expected:]
+        else:
+            result = b""
 
         len_expected = 6
         # Network configurations, which has the following struct: