diff --git a/Scripts/preprocess_daily.py b/Scripts/preprocess_daily.py
index cb2f02587..11b59aad1 100644
--- a/Scripts/preprocess_daily.py
+++ b/Scripts/preprocess_daily.py
@@ -634,7 +634,7 @@ class DailyPreprocessor():
             all_redsigns = (cmatch.move_no==18) & ~ out_true
 
             # 보행신호시/좌회전시 진입/진출 엣지id 배정
-            cmatch[['inc_edge_id', 'out_edge_id']] = None
+            cmatch[['inc_edge_id', 'out_edge_id']] = np.nan
             if condition == "보행신호시":
                 cmatch.loc[pedes_flag, ['inc_edge_id', 'out_edge_id']] = [inc_edge_id, out_edge_id]
             elif condition == "좌회전시":