diff --git a/dblayer.php b/dblayer.php
index 372e55f..8914ddc 100644
--- a/dblayer.php
+++ b/dblayer.php
@@ -333,6 +333,7 @@ class dblayer extends PDO
     {
       if (is_array ($columns))
       {
+        // Multiple columns in unique
         $select = array ();
         $select[] = array ($this->primary, $updatekey, "!=");
         foreach ($columns as $col)
@@ -354,11 +355,10 @@ class dblayer extends PDO
       }
       else
       {
-        // FIXME ! Problem if $datasOK contains primary / else can be warned on 
-        //         $datasOK[$columns] if it doesn't exists
-        if (array_key_exists ($columns, $datasOK)) continue;
+        // One column in unique 
+        if (!array_key_exists ($columns, $datasOK)) continue;
         $select = array ();
-        if ($columns !== $this->primary)
+        if ($columns === $this->primary)
           $select[] = array ($this->primary, $updatekey, "!=");
         $select[] = array ($columns, $datasOK[$columns]);
         $rc = $this->read ($select,