diff --git a/manifest b/manifest
index a7780cc0b2..022a259127 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Mark\san\sunreachable\sbranch\sin\srtree.
-D 2021-09-16T14:07:09.331
+C Add\sa\sreference\scounter\sto\sa\sstructure\sused\sinternally\sby\sthe\sTcl\sinterface\sso\sthat\sit\sdoes\snot\ssegfault\sif\sthe\sdatabase\sconnection\sis\sclosed\sfrom\sany\sof\sthe\svarious\scallback\sscripts\sthat\smay\sbe\sinvoked.
+D 2021-09-16T14:17:14.659
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -554,7 +554,7 @@ F src/sqliteInt.h b62ee1fc9da3634616b969abe8b55fafcb540e4e7e5637ee2a2bb5fa477f4a
 F src/sqliteLimit.h d7323ffea5208c6af2734574bae933ca8ed2ab728083caa117c9738581a31657
 F src/status.c 4b8bc2a6905163a38b739854a35b826c737333fab5b1f8e03fa7eb9a4799c4c1
 F src/table.c 0f141b58a16de7e2fbe81c308379e7279f4c6b50eb08efeec5892794a0ba30d1
-F src/tclsqlite.c 05663f6b5010b044eac0ef22fc8fb5ea3406d2502700a898261683258042c88b
+F src/tclsqlite.c 428e813dabf82804bc13196af35a0c3c6ef4347fe557fa6717c5c66bba6e8520
 F src/test1.c 63761c2be2607f1b425fde991beda48aed384f8d67f2b4ee549174c88b433009
 F src/test2.c 3efb99ab7f1fc8d154933e02ae1378bac9637da5
 F src/test3.c 61798bb0d38b915067a8c8e03f5a534b431181f802659a6616f9b4ff7d872644
@@ -1449,7 +1449,7 @@ F test/tabfunc01.test d6821e7042e5653104dac0c63d75eff24a2415ab1889fc68b5db7fde59
 F test/table.test eb3463b7add9f16a5bb836badf118cf391b809d09fdccd1f79684600d07ec132
 F test/tableapi.test ecbcc29c4ab62c1912c3717c48ea5c5e59f7d64e4a91034e6148bd2b82f177f4
 F test/tableopts.test dba698ba97251017b7c80d738c198d39ab747930
-F test/tclsqlite.test 316c96f974f0e6d7480186e3f5bb53413e5ee5480596544a97484888912a365c
+F test/tclsqlite.test 97cda6e4843e9f3e06c56f656d9b77ee0178fe1ee33fb09a6eeae8f125757ac1
 F test/tempdb.test 4cdaa23ddd8acb4d79cbb1b68ccdfd09b0537aaba909ca69a876157c2a2cbd08
 F test/tempdb2.test 353864e96fd3ae2f70773d0ffbf8b1fe48589b02c2ec05013b540879410c3440
 F test/tempfault.test 0c0d349c9a99bf5f374655742577f8712c647900
@@ -1923,7 +1923,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P d26963a530ccbe36a174823d2f0bd7e06c6fca4f38ecdd04cd700c4000cc3719
-R 46d60b2ce92f695e97622b11cd163c23
-U drh
-Z bd29d46e35cb4f2d20bb44fb2445a352
+P e6c4afd5b365b8dea8c0742352a09029da0f9715dd2407d4ccf53f1e0a4ce625
+R 2bba8a7e10b47ebc6a75449daec54256
+U dan
+Z 6227cb06cae79681b47e5b13e50e774e
diff --git a/manifest.uuid b/manifest.uuid
index e0e0600d9b..ad44cfcfeb 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-e6c4afd5b365b8dea8c0742352a09029da0f9715dd2407d4ccf53f1e0a4ce625
\ No newline at end of file
+e54a33ce56432b23947583d34cf12fc64a55bbc49eb77c7f33cff5926df51070
\ No newline at end of file
diff --git a/src/tclsqlite.c b/src/tclsqlite.c
index 8874ab7699..b9b78b42b9 100644
--- a/src/tclsqlite.c
+++ b/src/tclsqlite.c
@@ -181,6 +181,7 @@ struct SqliteDb {
   int nVMStep;               /* Another statistic for most recent operation */
   int nTransaction;          /* Number of nested [transaction] methods */
   int openFlags;             /* Flags used to open.  (SQLITE_OPEN_URI) */
+  int nRef;                  /* Delete object when this reaches 0 */
 #ifdef SQLITE_TEST
   int bLegacyPrepare;        /* True to use sqlite3_prepare() */
 #endif
@@ -517,64 +518,84 @@ static void flushStmtCache(SqliteDb *pDb){
   pDb->stmtList = 0;
 }
 
+/*
+** Increment the reference counter on the SqliteDb object. The reference
+** should be released by calling delDatabaseRef().
+*/
+static void addDatabaseRef(SqliteDb *pDb){
+  pDb->nRef++;
+}
+
+/*
+** Decrement the reference counter associated with the SqliteDb object.
+** If it reaches zero, delete the object.
+*/
+static void delDatabaseRef(SqliteDb *pDb){
+  assert( pDb->nRef>0 );
+  pDb->nRef--;
+  if( pDb->nRef==0 ){
+    flushStmtCache(pDb);
+    closeIncrblobChannels(pDb);
+    sqlite3_close(pDb->db);
+    while( pDb->pFunc ){
+      SqlFunc *pFunc = pDb->pFunc;
+      pDb->pFunc = pFunc->pNext;
+      assert( pFunc->pDb==pDb );
+      Tcl_DecrRefCount(pFunc->pScript);
+      Tcl_Free((char*)pFunc);
+    }
+    while( pDb->pCollate ){
+      SqlCollate *pCollate = pDb->pCollate;
+      pDb->pCollate = pCollate->pNext;
+      Tcl_Free((char*)pCollate);
+    }
+    if( pDb->zBusy ){
+      Tcl_Free(pDb->zBusy);
+    }
+    if( pDb->zTrace ){
+      Tcl_Free(pDb->zTrace);
+    }
+    if( pDb->zTraceV2 ){
+      Tcl_Free(pDb->zTraceV2);
+    }
+    if( pDb->zProfile ){
+      Tcl_Free(pDb->zProfile);
+    }
+    if( pDb->zBindFallback ){
+      Tcl_Free(pDb->zBindFallback);
+    }
+    if( pDb->zAuth ){
+      Tcl_Free(pDb->zAuth);
+    }
+    if( pDb->zNull ){
+      Tcl_Free(pDb->zNull);
+    }
+    if( pDb->pUpdateHook ){
+      Tcl_DecrRefCount(pDb->pUpdateHook);
+    }
+    if( pDb->pPreUpdateHook ){
+      Tcl_DecrRefCount(pDb->pPreUpdateHook);
+    }
+    if( pDb->pRollbackHook ){
+      Tcl_DecrRefCount(pDb->pRollbackHook);
+    }
+    if( pDb->pWalHook ){
+      Tcl_DecrRefCount(pDb->pWalHook);
+    }
+    if( pDb->pCollateNeeded ){
+      Tcl_DecrRefCount(pDb->pCollateNeeded);
+    }
+    Tcl_Free((char*)pDb);
+  }
+}
+
 /*
 ** TCL calls this procedure when an sqlite3 database command is
 ** deleted.
 */
 static void SQLITE_TCLAPI DbDeleteCmd(void *db){
   SqliteDb *pDb = (SqliteDb*)db;
-  flushStmtCache(pDb);
-  closeIncrblobChannels(pDb);
-  sqlite3_close(pDb->db);
-  while( pDb->pFunc ){
-    SqlFunc *pFunc = pDb->pFunc;
-    pDb->pFunc = pFunc->pNext;
-    assert( pFunc->pDb==pDb );
-    Tcl_DecrRefCount(pFunc->pScript);
-    Tcl_Free((char*)pFunc);
-  }
-  while( pDb->pCollate ){
-    SqlCollate *pCollate = pDb->pCollate;
-    pDb->pCollate = pCollate->pNext;
-    Tcl_Free((char*)pCollate);
-  }
-  if( pDb->zBusy ){
-    Tcl_Free(pDb->zBusy);
-  }
-  if( pDb->zTrace ){
-    Tcl_Free(pDb->zTrace);
-  }
-  if( pDb->zTraceV2 ){
-    Tcl_Free(pDb->zTraceV2);
-  }
-  if( pDb->zProfile ){
-    Tcl_Free(pDb->zProfile);
-  }
-  if( pDb->zBindFallback ){
-    Tcl_Free(pDb->zBindFallback);
-  }
-  if( pDb->zAuth ){
-    Tcl_Free(pDb->zAuth);
-  }
-  if( pDb->zNull ){
-    Tcl_Free(pDb->zNull);
-  }
-  if( pDb->pUpdateHook ){
-    Tcl_DecrRefCount(pDb->pUpdateHook);
-  }
-  if( pDb->pPreUpdateHook ){
-    Tcl_DecrRefCount(pDb->pPreUpdateHook);
-  }
-  if( pDb->pRollbackHook ){
-    Tcl_DecrRefCount(pDb->pRollbackHook);
-  }
-  if( pDb->pWalHook ){
-    Tcl_DecrRefCount(pDb->pWalHook);
-  }
-  if( pDb->pCollateNeeded ){
-    Tcl_DecrRefCount(pDb->pCollateNeeded);
-  }
-  Tcl_Free((char*)pDb);
+  delDatabaseRef(pDb);
 }
 
 /*
@@ -1246,6 +1267,7 @@ static int SQLITE_TCLAPI DbTransPostCmd(
   }
   pDb->disableAuth--;
 
+  delDatabaseRef(pDb);
   return rc;
 }
 
@@ -1579,6 +1601,7 @@ static void dbEvalInit(
     Tcl_IncrRefCount(pArray);
   }
   p->evalFlags = evalFlags;
+  addDatabaseRef(p->pDb);
 }
 
 /*
@@ -1719,6 +1742,7 @@ static void dbEvalFinalize(DbEvalContext *p){
   }
   Tcl_DecrRefCount(p->pSql);
   dbReleaseColumnNames(p);
+  delDatabaseRef(p->pDb);
 }
 
 /*
@@ -3435,6 +3459,7 @@ deserialize_error:
     ** opened above. If not using NRE, evaluate the script directly, then
     ** call function DbTransPostCmd() to commit (or rollback) the transaction
     ** or savepoint.  */
+    addDatabaseRef(pDb);          /* DbTransPostCmd() calls delDatabaseRef() */
     if( DbUseNre() ){
       Tcl_NRAddCallback(interp, DbTransPostCmd, cd, 0, 0, 0);
       (void)Tcl_NREvalObj(interp, pScript, 0);
@@ -3842,6 +3867,7 @@ static int SQLITE_TCLAPI DbMain(
   }else{
     Tcl_CreateObjCommand(interp, zArg, DbObjCmd, (char*)p, DbDeleteCmd);
   }
+  p->nRef = 1;
   return TCL_OK;
 }
 
diff --git a/test/tclsqlite.test b/test/tclsqlite.test
index b7e160e07e..c2fa522e64 100644
--- a/test/tclsqlite.test
+++ b/test/tclsqlite.test
@@ -848,4 +848,40 @@ do_catchsql_test 19.911 {
 } {1 {invalid command name "bind_fallback_does_not_exist"}}
 db bind_fallback {}
 
+#-------------------------------------------------------------------------
+do_test 20.0 {
+  db transaction {
+    db close
+  }
+} {}
+
+do_test 20.1 {
+  sqlite3 db test.db
+  set rc [catch {
+    db eval {SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3} { db close }
+  } msg]
+  list $rc $msg
+} {1 {invalid command name "db"}}
+  
+
+proc closedb {} {
+  db close
+  return 10
+}
+proc func1 {} { return 1 }
+
+sqlite3 db test.db
+db func closedb closedb
+db func func1 func1
+
+do_test 20.2 {
+  set rc [catch {
+    db eval {
+      SELECT closedb(),func1() UNION ALL SELECT 20,30 UNION ALL SELECT 30,40
+    }
+  } msg]
+  list $rc $msg
+} {0 {10 1 20 30 30 40}}
+
 finish_test
+