diff --git a/fix_dir_dates.sh b/fix_dir_dates.sh
index f5c281b..8986f60 100755
--- a/fix_dir_dates.sh
+++ b/fix_dir_dates.sh
@@ -9,7 +9,7 @@ do
     if [ -n "${last_file}" ]; then
         echo "Last modified file is '${last_file}'"
         filetime="$(jq '.info_dict.filetime' -- "${last_file}" )"
-        if [ "${filetime}" != "null" ]; then
+        if [ "${filetime}" != "null" ] && [ -n "${filetime}" ]; then
             last_file_time_formated=$(date -d "@${filetime}" +%Y%m%d%H%M.%S)
             touch -t "${last_file_time_formated}" -- "${dir}"
         else