diff --git a/scripts/generate.sh b/scripts/generate.sh
index 9f4466d..65130a4 100644
--- a/scripts/generate.sh
+++ b/scripts/generate.sh
@@ -15,10 +15,12 @@ wget -O ./site/data/tube.json https://tube.crapaud-fou.org/feeds/videos.json?sor
 # chat
 pip3 install -r ./scripts/requirements.txt
 echo $ROCKETCHAT_GENERATION
-if [ $ROCKETCHAT_GENERATION = "MONTHLY" ] ; then
-    python3 ./scripts/generate_chat_stat_monthly.py
-elif [ $ROCKETCHAT_GENERATION = "DAILY" ]; then
-    python3 ./scripts/generate_chat_stat_daily.py
+if [ -n "$ROCKETCHAT_GENERATION" ]; then
+    if [ $ROCKETCHAT_GENERATION = "MONTHLY" ] ; then
+        python3 ./scripts/generate_chat_stat_monthly.py
+    elif [ $ROCKETCHAT_GENERATION = "DAILY" ]; then
+        python3 ./scripts/generate_chat_stat_daily.py
+    fi
 fi
 
 python3 ./scripts/generate_chat_info.py