diff --git a/scripts/common.sh b/scripts/common.sh
index fdb888e..54b8659 100644
--- a/scripts/common.sh
+++ b/scripts/common.sh
@@ -164,5 +164,5 @@ setDebugToFile() {
 }
 
 debug() {
-    [ -n ${debugFlagToFile+x} ] && [ $debugFlagToFile = true ] && tee -a CocoRice.log > /dev/null
+    [[ -z ${debugFlagToFile+x} || $debugFlagToFile = true ]] && tee -a CocoRice.log > /dev/null
 }