diff --git a/src/Dibi/Connection.php b/src/Dibi/Connection.php
index 3e54a395..1088af4b 100644
--- a/src/Dibi/Connection.php
+++ b/src/Dibi/Connection.php
@@ -337,6 +337,10 @@ class Connection implements IConnection
 	 */
 	public function begin(string $savepoint = null): void
 	{
+		if ($this->transactionDepth !== 0) {
+			throw new \LogicException(__METHOD__ . '() call is forbidden inside a transaction() callback');
+		}
+
 		if (!$this->driver) {
 			$this->connect();
 		}
@@ -361,6 +365,10 @@ class Connection implements IConnection
 	 */
 	public function commit(string $savepoint = null): void
 	{
+		if ($this->transactionDepth !== 0) {
+			throw new \LogicException(__METHOD__ . '() call is forbidden inside a transaction() callback');
+		}
+
 		if (!$this->driver) {
 			$this->connect();
 		}
@@ -385,6 +393,10 @@ class Connection implements IConnection
 	 */
 	public function rollback(string $savepoint = null): void
 	{
+		if ($this->transactionDepth !== 0) {
+			throw new \LogicException(__METHOD__ . '() call is forbidden inside a transaction() callback');
+		}
+
 		if (!$this->driver) {
 			$this->connect();
 		}
diff --git a/tests/dibi/Connection.transactions.phpt b/tests/dibi/Connection.transactions.phpt
index b24f8e0a..457007a1 100644
--- a/tests/dibi/Connection.transactions.phpt
+++ b/tests/dibi/Connection.transactions.phpt
@@ -108,3 +108,24 @@ test('nested transaction() call success', function () use ($conn) {
 	});
 	Assert::same(7, (int) $conn->query('SELECT COUNT(*) FROM [products]')->fetchSingle());
 });
+
+
+test('begin(), commit() & rollback() calls are forbidden in transaction()', function () use ($conn) {
+	Assert::exception(function () use ($conn) {
+		$conn->transaction(function (Dibi\Connection $connection) {
+			$connection->begin();
+		});
+	}, \LogicException::class, Dibi\Connection::class . '::begin() call is forbidden inside a transaction() callback');
+
+	Assert::exception(function () use ($conn) {
+		$conn->transaction(function (Dibi\Connection $connection) {
+			$connection->commit();
+		});
+	}, \LogicException::class, Dibi\Connection::class . '::commit() call is forbidden inside a transaction() callback');
+
+	Assert::exception(function () use ($conn) {
+		$conn->transaction(function (Dibi\Connection $connection) {
+			$connection->rollback();
+		});
+	}, \LogicException::class, Dibi\Connection::class . '::rollback() call is forbidden inside a transaction() callback');
+});