From d4bcf2c15a13da1dcbf7d8c0cf08aa2f33f8e4a7 Mon Sep 17 00:00:00 2001
From: Jussi Saurio <jussi.saurio@gmail.com>
Date: Thu, 25 Sep 2025 09:21:35 +0300
Subject: [PATCH] mvcc: disallow BEGIN after BEGIN CONCURRENT

---
 core/vdbe/execute.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/vdbe/execute.rs b/core/vdbe/execute.rs
index 5d0351d59..a947d1aa5 100644
--- a/core/vdbe/execute.rs
+++ b/core/vdbe/execute.rs
@@ -2451,6 +2451,11 @@ pub fn op_auto_commit(
                     "cannot commit - no transaction is active".to_string(),
                 ));
             }
+        } else {
+            let is_begin = !*auto_commit && !*rollback;
+            return Err(LimboError::TxError(
+                "cannot use BEGIN after BEGIN CONCURRENT".to_string(),
+            ));
         }
     }