diff --git a/prebuilt/common/bin/backuptool.sh b/prebuilt/common/bin/backuptool.sh
index fe8ca43..b902999 100755
--- a/prebuilt/common/bin/backuptool.sh
+++ b/prebuilt/common/bin/backuptool.sh
@@ -42,10 +42,11 @@
 }
 
 check_blacklist() {
-  if [ -f /system/addon.d/blacklist ];then
+  if [ -f /system/addon.d/blacklist -a -d /$1/addon.d/ ]; then
       ## Discard any known bad backup scripts
       cd /$1/addon.d/
       for f in *sh; do
+          [ -f $f ] || continue
           s=$(md5sum $f | cut -c-32)
           grep -q $s /system/addon.d/blacklist && rm -f $f
       done