diff --git a/robots/little_john/telemetry/code/monitor/graph_plotter_rewrite.py b/robots/little_john/telemetry/code/monitor/graph_plotter_rewrite.py
index 728ff3f..35d2f07 100755
--- a/robots/little_john/telemetry/code/monitor/graph_plotter_rewrite.py
+++ b/robots/little_john/telemetry/code/monitor/graph_plotter_rewrite.py
@@ -27,10 +27,10 @@ logging.info("Logging system active")
 
 datafeed = selectserial()
 
-if datafeed == None:
+if datafeed == 'Sorry, no serial devices found.' or None:
     logging.critical("Failed to open serial port")
     sys.exit()
-
+    
 if platform.system()=='Windows':
     os='Windows'
 else:
--
libgit2 0.21.2