diff --git a/lib/Doctrine/DBAL/Connection.php b/lib/Doctrine/DBAL/Connection.php
index f714af9f2a4..623c09142d2 100644
--- a/lib/Doctrine/DBAL/Connection.php
+++ b/lib/Doctrine/DBAL/Connection.php
@@ -1667,9 +1667,6 @@ public function transactional(Closure $func)
         $this->beginTransaction();
         try {
             $res = $func($this);
-            $this->commit();
-
-            return $res;
         } catch (Throwable $e) {
             $this->rollBack();
 
@@ -1791,7 +1788,7 @@ public function commit()
             } catch (Throwable $ex) {
                 $this->updateTransactionStateAfterCommit();
 
-                throw DBALException::driverExceptionDuringQuery($this->_driver, $ex, 'COMMIT');
+                $this->handleExceptionDuringQuery($ex, 'COMMIT');
             }
 
             if ($logger) {
@@ -1809,19 +1806,19 @@ public function commit()
         }
 
         $this->updateTransactionStateAfterCommit();
+
+        return $result;
     }
 
-    private function updateTransactionStateAfterCommit() : void
+    private function updateTransactionStateAfterCommit(): void
     {
         --$this->transactionNestingLevel;
 
         if ($this->autoCommit !== false || $this->transactionNestingLevel !== 0) {
-            return $result;
+            return;
         }
 
         $this->beginTransaction();
-
-        return $result;
     }
 
     /**