Fix bug were cards read before logging in cannot be read until a logout occurs

diff --git a/VendServer/VendServer.py b/VendServer/VendServer.py
index 8fbf11e..c16cff1 100755 (executable)
--- a/VendServer/VendServer.py
+++ b/VendServer/VendServer.py
@@ -887,6 +887,7 @@ def handle_mifare_event(state, event, params, v, vstatus):
                         (center('SORRY'), False, 0.5)])
                vstatus.cur_user = ''
                vstatus.cur_pin = ''
+               _last_card_id = -1
        
                reset_idler(v, vstatus, 2)
                return