diff --git a/pyButtons.py b/pyButtons.py
index 69b6cbe..03b0b83 100644
--- a/pyButtons.py
+++ b/pyButtons.py
@@ -51,6 +51,9 @@ def send_CAN():
 
 
 def main():
+    global client
+    global isRunning
+
     btn_su = Button(SU)
     btn_giu = Button(GIU)
     btn_sx = Button(SX)