diff --git a/selfdrive/car/interfaces.py b/selfdrive/car/interfaces.py
index a402a7797a..5fe64832c8 100644
--- a/selfdrive/car/interfaces.py
+++ b/selfdrive/car/interfaces.py
@@ -460,8 +460,9 @@ class CarInterfaceBase(ABC):
       events.add(EventName.doorOpen)
     if cs_out.seatbeltUnlatched and cs_out.gearShifter != GearShifter.park:
       events.add(EventName.seatbeltNotLatched)
-    if cs_out.gearShifter != GearShifter.drive and cs_out.gearShifter not in extra_gears and not \
-            (cs_out.gearShifter == GearShifter.unknown and self.gear_warning < int(0.5/DT_CTRL)):
+    if cs_out.gearShifter != GearShifter.drive and (extra_gears is None or
+       cs_out.gearShifter not in extra_gears) and not (cs_out.gearShifter == GearShifter.unknown and
+       self.gear_warning < int(0.5/DT_CTRL)):
       if cs_out.vEgo < 5:
         events.add(EventName.silentWrongGear)
       else: