diff --git a/bb.sh b/bb.sh
index 1694830..cb37fa0 100755
--- a/bb.sh
+++ b/bb.sh
@@ -784,6 +784,7 @@ tags_in_post() {
 # Arguments are tags
 # Prints one line with space-separated tags to stdout
 posts_with_tags() {
+    [ $# -lt 1 ] && return
     tag_files="$(echo "$@" | sed "s/\S\+/tag_&.html/g")"
     sed -n '/^<h3><a class="ablack" href="[^"]*">/{s/.*href="\([^"]*\)">.*/\1/;p}' $tag_files
 }