diff --git a/src/Libs/ModelMySQL.php b/src/Libs/ModelMySQL.php
index 759cf34..4f1f8d7 100644
--- a/src/Libs/ModelMySQL.php
+++ b/src/Libs/ModelMySQL.php
@@ -243,8 +243,10 @@ class ModelMySQL {
     $atts = $this->getVars();
     
     foreach ($atts as $key => $value) {
-      $into[] = "`$key`";
-      $values[] = "'".$db->real_escape_string($value)."'";
+      if (isset($value)) {
+        $into[] = "`$key`";
+        $values[] = "'".$db->real_escape_string($value)."'";
+      }
     }
     
     $table = static::table();