diff --git a/python_payload/st3m/ui/widgets/__init__.py b/python_payload/st3m/ui/widgets/__init__.py
index 436c78d47288016975ec6d8b2684e5d15aa59a04..500cea8153c74268adf907dd48c4e34a6c3b0e95 100644
--- a/python_payload/st3m/ui/widgets/__init__.py
+++ b/python_payload/st3m/ui/widgets/__init__.py
@@ -144,6 +144,8 @@ class Inclinometer(Widget):
         return self._pitch_buf[index]
 
     def _filter(self, getter):
+        if self._acc_buf is None:
+            return None
         ret = 0  # do NOT initialize as complex to make the hack below work
         index = self._next_index
         for _ in range(self._filter_len):