diff --git a/cake/libs/model/datasources/dbo/dbo_mysql.php b/cake/libs/model/datasources/dbo/dbo_mysql.php
index 1cdb1ddc1..749b9d0a6 100644
--- a/cake/libs/model/datasources/dbo/dbo_mysql.php
+++ b/cake/libs/model/datasources/dbo/dbo_mysql.php
@@ -238,7 +238,7 @@ class DboMysql extends DboSource {
 			foreach ($this->map as $col => $meta) {
 				list($table, $column, $type) = $meta;
 				$resultRow[$table][$column] = $row[$col];
-				if ($type == 'boolean') {
+				if ($type == 'boolean' && !is_null($row[$col])) {
 					$resultRow[$table][$column] = $this->boolean($resultRow[$table][$column]);
 				}
 			}
diff --git a/cake/libs/model/datasources/dbo/dbo_postgres.php b/cake/libs/model/datasources/dbo/dbo_postgres.php
index b6106d87b..9a397a0cc 100644
--- a/cake/libs/model/datasources/dbo/dbo_postgres.php
+++ b/cake/libs/model/datasources/dbo/dbo_postgres.php
@@ -707,7 +707,7 @@ class DboPostgres extends DboSource {
 
 				switch ($type) {
 					case 'bool':
-						$resultRow[$table][$column] = $this->boolean($row[$index]);
+						$resultRow[$table][$column] = is_null($row[$index]) ? null : $this->boolean($row[$index]);
 					break;
 					case 'binary':
 					case 'bytea':
diff --git a/cake/libs/model/datasources/dbo/dbo_sqlite.php b/cake/libs/model/datasources/dbo/dbo_sqlite.php
index ae5c25f11..63e1a1e40 100644
--- a/cake/libs/model/datasources/dbo/dbo_sqlite.php
+++ b/cake/libs/model/datasources/dbo/dbo_sqlite.php
@@ -336,7 +336,7 @@ class DboSqlite extends DboSource {
 			foreach ($this->map as $col => $meta) {
 				list($table, $column, $tpye) = $meta;
 				$resultRow[$table][$column] = $row[$col];
-				if ($type === 'boolean') {
+				if ($type == 'boolean' && !is_null($row[$col])) {
 					$resultRow[$table][$column] = $this->boolean($resultRow[$table][$column]);
 				}
 			}