1 files changed, 2 insertions, 0 deletions
diff --git a/src/insert.c b/src/insert.c
index 0b7744651..f8112f010 100644
--- a/src/insert.c
+++ b/src/insert.c
@@ -237,6 +237,7 @@ void sqlite3AutoincrementBegin(Parse *pParse){
   for(p = pParse->pAinc; p; p = p->pNext){
     pDb = &db->aDb[p->iDb];
     memId = p->regCtr;
+    assert( sqlite3SchemaMutexHeld(db, 0, pDb->pSchema) );
     sqlite3OpenTable(pParse, 0, p->iDb, pDb->pSchema->pSeqTab, OP_OpenRead);
     addr = sqlite3VdbeCurrentAddr(v);
     sqlite3VdbeAddOp4(v, OP_String8, 0, memId-1, 0, p->pTab->zName, 0);
@@ -287,6 +288,7 @@ void sqlite3AutoincrementEnd(Parse *pParse){
     int memId = p->regCtr;
 
     iRec = sqlite3GetTempReg(pParse);
+    assert( sqlite3SchemaMutexHeld(db, 0, pDb->pSchema) );
     sqlite3OpenTable(pParse, 0, p->iDb, pDb->pSchema->pSeqTab, OP_OpenWrite);
     j1 = sqlite3VdbeAddOp1(v, OP_NotNull, memId+1);
     j2 = sqlite3VdbeAddOp0(v, OP_Rewind);