diff --git a/dabo/analyze.sh b/dabo/analyze.sh
index 19c7cfe..71999ea 100755
--- a/dabo/analyze.sh
+++ b/dabo/analyze.sh
@@ -83,6 +83,7 @@ function analyze {
     fi
     # Chart Part
     local f_score=${f_buy_score}
+    [ -z "${f_buy_score}" ] && f_buy_score=0
     if [ -z "${f_sell_score}" ] 
     then
       f_sell_score=0