diff --git a/core/models/mvc_database_adapter.php b/core/models/mvc_database_adapter.php
index 7175fdc..3ae875b 100644
--- a/core/models/mvc_database_adapter.php
+++ b/core/models/mvc_database_adapter.php
@@ -184,10 +184,13 @@ public function get_insert_columns_sql($data) {
     public function get_insert_values_sql($data) {
         $values = array();
         foreach ($data as $value) {
-            if($value == null){
+            if ($value === null) {
                 $values[] = 'NULL';
-            }
-            else{
+            } elseif ($value === false) {
+                $values[] = 'FALSE';
+            } elseif ($value === true) {
+                $values[] = 'TRUE';
+            } else {
                 $values[] = '"'.$this->escape($value).'"';
             }
         }
@@ -238,4 +241,4 @@ public function delete_all($options) {
 
 }
 
-?>
\ No newline at end of file
+?>