diff --git a/lib/adapters/transformers/sql.js b/lib/adapters/transformers/sql.js
index 91d7cec1..56298ae5 100644
--- a/lib/adapters/transformers/sql.js
+++ b/lib/adapters/transformers/sql.js
@@ -111,7 +111,7 @@ var sql = utils.mixin(new BaseTransformer(), new (function () {
       , val = comp.value
       , ret = '';
 
-    if (utils.isEmpty(prop)) {
+    if (utils.isEmpty(val)) {
       ret = 'NULL';
     }
     else {