diff --git a/DownKyi.Core/Storage/Database/DbHelper.cs b/DownKyi.Core/Storage/Database/DbHelper.cs
index 56b4c57..a2e753f 100644
--- a/DownKyi.Core/Storage/Database/DbHelper.cs
+++ b/DownKyi.Core/Storage/Database/DbHelper.cs
@@ -72,6 +72,8 @@ namespace DownKyi.Core.Storage.Database
///
public void Open()
{
+ if (conn == null) { return; }
+
if (!IsOpen())
{
conn.Open();
@@ -83,6 +85,8 @@ namespace DownKyi.Core.Storage.Database
///
public void Close()
{
+ if (conn == null) { return; }
+
if (IsOpen())
{
conn.Close();
@@ -97,6 +101,8 @@ namespace DownKyi.Core.Storage.Database
///
public void ExecuteNonQuery(string sql, Action action = null)
{
+ if (conn == null) { return; }
+
try
{
lock (conn)
@@ -129,6 +135,8 @@ namespace DownKyi.Core.Storage.Database
///
public void ExecuteQuery(string sql, Action action)
{
+ if (conn == null) { return; }
+
try
{
lock (conn)