Fix order of checks

src/Pgsql/PgsqlDriver.php

@@ -271,17 +271,17 @@ public function getTableColumns($table, $typeOnly = true)
 			{
 				if ($field->Default !== null)
 				{
-					// Change Postgresql's NULL::* type with PHP's null one
-					if (preg_match('/^NULL::*/', $field->Default))
-					{
-						$field->Default = null;
-					}
-
 					// Normalise default values like datetime
 					if (preg_match('/^\'(.*)\'::.*/', $field->Default, $matches))
 					{
 						$field->Default = $matches[1];
 					}
+
+					// Change Postgresql's NULL::* type with PHP's null one. Do this last to avoid PHP type issues in PHP 8.1 and up
+					if (preg_match('/^NULL::*/', $field->Default))
+					{
+						$field->Default = null;
+					}
 				}
 
 				// Do some dirty translation to MySQL output.