From caacefae91fbb7e70da3f14c86c2fd14a69f4004 Mon Sep 17 00:00:00 2001
From: Alex Zaytsev <hazzik@gmail.com>
Date: Sat, 29 May 2021 15:29:45 +1200
Subject: [PATCH] Fix possible ArgumentNullException when provider is unable to
 open a connection

---
 src/NHibernate/Tool/hbm2ddl/SchemaExport.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/NHibernate/Tool/hbm2ddl/SchemaExport.cs b/src/NHibernate/Tool/hbm2ddl/SchemaExport.cs
index 1cdd27614fe..a5b97a6c21a 100644
--- a/src/NHibernate/Tool/hbm2ddl/SchemaExport.cs
+++ b/src/NHibernate/Tool/hbm2ddl/SchemaExport.cs
@@ -468,7 +468,11 @@ private void InitConnectionAndExecute(Action<string> scriptAction, bool execute,
 			{
 				if (connectionProvider != null)
 				{
-					connectionProvider.CloseConnection(connection);
+					if (connection != null)
+					{
+						connectionProvider.CloseConnection(connection);
+					}
+
 					connectionProvider.Dispose();
 				}
 			}