From 350a9e2e5bee31f518be111bbd7564418f27cf1e Mon Sep 17 00:00:00 2001
From: Marianpol <marcin.musial20@gmail.com>
Date: Sun, 6 Jun 2021 11:58:32 +0200
Subject: [PATCH] No data in response fix

---
 pyren/mod_elm.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pyren/mod_elm.py b/pyren/mod_elm.py
index 3ad625e..cd419bc 100644
--- a/pyren/mod_elm.py
+++ b/pyren/mod_elm.py
@@ -1517,6 +1517,9 @@ class ELM:
         nBytes = 0  # number bytes in response
         nFrames = 0  # numer frames in response
 
+        if len (responses) == 0:  # no data in response
+            return ""
+
         if responses[0][:1] == '0':  # single frame (sf)
             nBytes = int(responses[0][1:2], 16)
             nFrames = 1