--- 1/auto-fu.zsh
+++ 1/auto-fu.zsh
@@ -287,7 +287,7 @@
 
 afu-eof-maybe () {
   local eof="$1"; shift
-  [[ "$BUFFER" != '' ]] || { $eof; return }
+  [[ -z $BUFFER ]] && { $eof; return }
   "$@"
 }