--- orig/acidfree/acidfree.module	2007-08-14 14:02:38.000000000 -0400
+++ patched/acidfree/acidfree.module	2007-09-14 14:10:28.000000000 -0400
     return implode('', $filter);
   }
   else {
-    return 'CONCAT('. implode(', ', $filter) .')';
+    if (count($filter)>1) {
+      return 'CONCAT('. implode(', ', $filter) .')';
+    } else {
+      return $filter[0];
+    }
   }
 }