diff --git a/src/Dibi/Drivers/FirebirdDriver.php b/src/Dibi/Drivers/FirebirdDriver.php
index a771da95..13361da4 100644
--- a/src/Dibi/Drivers/FirebirdDriver.php
+++ b/src/Dibi/Drivers/FirebirdDriver.php
@@ -96,7 +96,7 @@ class FirebirdDriver implements Dibi\Driver, Dibi\ResultDriver, Dibi\Reflector
 	 */
 	public function disconnect()
 	{
-		ibase_close($this->connection);
+		@ibase_close($this->connection); // @ - connection can be already disconnected
 	}
 
 
diff --git a/src/Dibi/Drivers/MsSqlDriver.php b/src/Dibi/Drivers/MsSqlDriver.php
index daf2b3f9..0713daef 100644
--- a/src/Dibi/Drivers/MsSqlDriver.php
+++ b/src/Dibi/Drivers/MsSqlDriver.php
@@ -78,7 +78,7 @@ class MsSqlDriver implements Dibi\Driver, Dibi\ResultDriver
 	 */
 	public function disconnect()
 	{
-		mssql_close($this->connection);
+		@mssql_close($this->connection); // @ - connection can be already disconnected
 	}
 
 
diff --git a/src/Dibi/Drivers/MySqlDriver.php b/src/Dibi/Drivers/MySqlDriver.php
index 4b812ebd..976d0279 100644
--- a/src/Dibi/Drivers/MySqlDriver.php
+++ b/src/Dibi/Drivers/MySqlDriver.php
@@ -139,7 +139,7 @@ class MySqlDriver implements Dibi\Driver, Dibi\ResultDriver
 	 */
 	public function disconnect()
 	{
-		mysql_close($this->connection);
+		@mysql_close($this->connection); // @ - connection can be already disconnected
 	}
 
 
diff --git a/src/Dibi/Drivers/MySqliDriver.php b/src/Dibi/Drivers/MySqliDriver.php
index 511b4e7c..060fc7ad 100644
--- a/src/Dibi/Drivers/MySqliDriver.php
+++ b/src/Dibi/Drivers/MySqliDriver.php
@@ -138,7 +138,7 @@ class MySqliDriver implements Dibi\Driver, Dibi\ResultDriver
 	 */
 	public function disconnect()
 	{
-		mysqli_close($this->connection);
+		@mysqli_close($this->connection); // @ - connection can be already disconnected
 	}
 
 
diff --git a/src/Dibi/Drivers/OdbcDriver.php b/src/Dibi/Drivers/OdbcDriver.php
index 85f46c6b..33fa3a20 100644
--- a/src/Dibi/Drivers/OdbcDriver.php
+++ b/src/Dibi/Drivers/OdbcDriver.php
@@ -88,7 +88,7 @@ class OdbcDriver implements Dibi\Driver, Dibi\ResultDriver, Dibi\Reflector
 	 */
 	public function disconnect()
 	{
-		odbc_close($this->connection);
+		@odbc_close($this->connection); // @ - connection can be already disconnected
 	}
 
 
diff --git a/src/Dibi/Drivers/OracleDriver.php b/src/Dibi/Drivers/OracleDriver.php
index 17607019..921972bd 100644
--- a/src/Dibi/Drivers/OracleDriver.php
+++ b/src/Dibi/Drivers/OracleDriver.php
@@ -95,7 +95,7 @@ class OracleDriver implements Dibi\Driver, Dibi\ResultDriver, Dibi\Reflector
 	 */
 	public function disconnect()
 	{
-		oci_close($this->connection);
+		@oci_close($this->connection); // @ - connection can be already disconnected
 	}
 
 
diff --git a/src/Dibi/Drivers/PostgreDriver.php b/src/Dibi/Drivers/PostgreDriver.php
index 95a6c34e..f0d84552 100644
--- a/src/Dibi/Drivers/PostgreDriver.php
+++ b/src/Dibi/Drivers/PostgreDriver.php
@@ -111,7 +111,7 @@ class PostgreDriver implements Dibi\Driver, Dibi\ResultDriver, Dibi\Reflector
 	 */
 	public function disconnect()
 	{
-		pg_close($this->connection);
+		@pg_close($this->connection); // @ - connection can be already disconnected
 	}
 
 
diff --git a/src/Dibi/Drivers/SqlsrvDriver.php b/src/Dibi/Drivers/SqlsrvDriver.php
index c5f1d4f1..2ccd1732 100644
--- a/src/Dibi/Drivers/SqlsrvDriver.php
+++ b/src/Dibi/Drivers/SqlsrvDriver.php
@@ -99,7 +99,7 @@ class SqlsrvDriver implements Dibi\Driver, Dibi\ResultDriver
 	 */
 	public function disconnect()
 	{
-		sqlsrv_close($this->connection);
+		@sqlsrv_close($this->connection); // @ - connection can be already disconnected
 	}
 
 
diff --git a/tests/dibi/Connection.connect.phpt b/tests/dibi/Connection.connect.phpt
index 4a821b12..16da29f4 100644
--- a/tests/dibi/Connection.connect.phpt
+++ b/tests/dibi/Connection.connect.phpt
@@ -36,3 +36,15 @@ test(function () use ($config) { // query string
 	Assert::same($config['driver'], $conn->getConfig('driver'));
 	Assert::type('Dibi\Driver', $conn->getDriver());
 });
+
+
+test(function () use ($config) {
+	$conn = new Connection($config);
+	Assert::true($conn->isConnected());
+
+	$conn->disconnect();
+	Assert::false($conn->isConnected());
+
+	$conn->disconnect();
+	Assert::false($conn->isConnected());
+});