diff --git a/features/communication.py b/features/communication.py
index 17e73a7..8b598a3 100644
--- a/features/communication.py
+++ b/features/communication.py
@@ -337,5 +337,6 @@ def calls_sms_features(
             )
             # Calculate new features and create additional columns
         )
+        .fillna(0.5, downcast="infer")
     )
     return count_joined