diff --git a/manifest b/manifest
index e75a8d5b89..240d8fc2aa 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Silently\signore\sredundant\sON\sCONFLICT\sclauses\sin\san\sUPSERT.\s\sOnly\sthe\sfirst\nON\sCONFLICT\sfor\seach\sindex\sis\sactive.\s\sDo\snot\sissue\san\serror,\ssince\sthat\smight\nbreak\slegacy\squeries.\s\sBut\signore\sthe\sredundant\sON\sCONFLICT\sclauses\sto\sprevent\nproblems\ssuch\sas\sdescribed\sin\s[forum:/forumpost/919c6579c8|forum\spost\s919c6579c8].
-D 2024-03-08T14:01:48.797
+C Add\snew\sassert()\sstatements,\swhich\sif\sthey\shad\sexisted\sthree\syears\sago,\nwould\shave\sdetected\sthe\scode\sgenerator\sproblem\sfixed\sby\sthe\sprevious\scheck-in.
+D 2024-03-08T15:39:59.999
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -820,11 +820,11 @@ F src/upsert.c 2e60567a0e9e8520c18671b30712a88dc73534474304af94f32bb5f3ef65ac65
 F src/utf.c f23165685a67b4caf8ec08fb274cb3f319103decfb2a980b7cfd55d18dfa855e
 F src/util.c f27a17e6e43fa362abea4db507a1c409f0adc8048ecf4c6479e8d162158ed529
 F src/vacuum.c 604fcdaebe76f3497c855afcbf91b8fa5046b32de3045bab89cc008d68e40104
-F src/vdbe.c 7a33c5bb37e12ce35ac2d1d56a6429288b0b56c940ba660265c1428c67883729
+F src/vdbe.c da8407be6055f5751bf85681542d130a320b4fd1f4d8719bf83a464743d9aae4
 F src/vdbe.h c2d78d15112c3fc5ab87f5e8e0b75d2db1c624409de2e858c3d1aafb1650bb4f
 F src/vdbeInt.h 949669dfd8a41550d27dcb905b494f2ccde9a2e6c1b0b04daa1227e2e74c2b2c
 F src/vdbeapi.c 8f57d60c89da0b60e6d4e272358c511f6bae4e24330bdb11f8b42f986d1bf21b
-F src/vdbeaux.c 66161ba75c4a2d86aab124fe3cbcc2a752d8e4b1fc8c1fc6e00625db4798168c
+F src/vdbeaux.c e52815bc11fccedcc7acb14ae98c607a1c5b6c773ff4d584cd192432540502c9
 F src/vdbeblob.c 13f9287b55b6356b4b1845410382d6bede203ceb29ef69388a4a3d007ffacbe5
 F src/vdbemem.c 213bf303826c0ef702e3a2a69dab2309d84b8381b822c6787885859fd7cd4c4e
 F src/vdbesort.c 237840ca1947511fa59bd4e18b9eeae93f2af2468c34d2427b059f896230a547
@@ -2101,7 +2101,7 @@ F tool/mkctimec.tcl a16682eae5f01f85e5861b2aa215ca0d46b4230658ee25977e02b4508566
 F tool/mkkeywordhash.c b9faa0ae7e14e4dbbcd951cddd786bf46b8a65bb07b129ba8c0cfade723aaffd
 F tool/mkmsvcmin.tcl 8897d515ef7f94772322db95a3b6fce6c614d84fe0bdd06ba5a1c786351d5a1d
 F tool/mkopcodec.tcl 33d20791e191df43209b77d37f0ff0904620b28465cca6990cf8d60da61a07ef
-F tool/mkopcodeh.tcl 769d9e6a8b462323150dc13a8539d6064664b72974f7894befe2491cc73e05cd
+F tool/mkopcodeh.tcl 2b4e6967a670ef21bf53a164964c35c6163277d002a4c6f56fa231d68c88d023
 F tool/mkopts.tcl 680f785fdb09729fd9ac50632413da4eadbdf9071535e3f26d03795828ab07fa
 F tool/mkpragmatab.tcl 32e359ccb21011958a821955254bd7a5fa7915d01a8c16fed91ffc8b40cb4adf
 F tool/mkshellc.tcl b7adf08b82de60811d2cb6af05ff59fc17e5cd6f3e98743c14eaaa3f8971fed0
@@ -2177,8 +2177,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 29d9eb7d55755604781e507f6ca36c50d62fa8d8589ab932d7cefca94ba24f3e
-R 854945d64d6a5cfe38a3cc1c6a5b5bd3
+P d0ea6b6ba64dba9d68c2b391ccf1171ea96fcdd7409dafdb2b697accb00246b8
+R e2ddfd9aa39901e567d105504257c018
 U drh
-Z 3c2e932dfbe4dcd203c5f3b4ed97d851
+Z 9df6c164111bd68c49bf51ae68acbbe9
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 492aebc3bd..249f75b766 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-d0ea6b6ba64dba9d68c2b391ccf1171ea96fcdd7409dafdb2b697accb00246b8
\ No newline at end of file
+166d1e5d26ef88e995f44182144891f60bd51c1aa585b4a148f01a920b2a8eea
\ No newline at end of file
diff --git a/src/vdbe.c b/src/vdbe.c
index 709ebd9fb8..faa12aaf8d 100644
--- a/src/vdbe.c
+++ b/src/vdbe.c
@@ -1129,7 +1129,7 @@ case OP_Return: {           /* in1 */
 **
 ** See also: EndCoroutine
 */
-case OP_InitCoroutine: {     /* jump */
+case OP_InitCoroutine: {     /* jump0 */
   assert( pOp->p1>0 &&  pOp->p1<=(p->nMem+1 - p->nCursor) );
   assert( pOp->p2>=0 && pOp->p2<p->nOp );
   assert( pOp->p3>=0 && pOp->p3<p->nOp );
@@ -1182,7 +1182,7 @@ case OP_EndCoroutine: {           /* in1 */
 **
 ** See also: InitCoroutine
 */
-case OP_Yield: {            /* in1, jump */
+case OP_Yield: {            /* in1, jump0 */
   int pcDest;
   pIn1 = &aMem[pOp->p1];
   assert( VdbeMemDynamic(pIn1)==0 );
@@ -2041,7 +2041,7 @@ case OP_AddImm: {            /* in1 */
 ** without data loss, then jump immediately to P2, or if P2==0
 ** raise an SQLITE_MISMATCH exception.
 */
-case OP_MustBeInt: {            /* jump, in1 */
+case OP_MustBeInt: {            /* jump0, in1 */
   pIn1 = &aMem[pOp->p1];
   if( (pIn1->flags & MEM_Int)==0 ){
     applyAffinity(pIn1, SQLITE_AFF_NUMERIC, encoding);
@@ -4725,10 +4725,10 @@ case OP_ColumnsUsed: {
 **
 ** See also: Found, NotFound, SeekGt, SeekGe, SeekLt
 */
-case OP_SeekLT:         /* jump, in3, group, ncycle */
-case OP_SeekLE:         /* jump, in3, group, ncycle */
-case OP_SeekGE:         /* jump, in3, group, ncycle */
-case OP_SeekGT: {       /* jump, in3, group, ncycle */
+case OP_SeekLT:         /* jump0, in3, group, ncycle */
+case OP_SeekLE:         /* jump0, in3, group, ncycle */
+case OP_SeekGE:         /* jump0, in3, group, ncycle */
+case OP_SeekGT: {       /* jump0, in3, group, ncycle */
   int res;           /* Comparison result */
   int oc;            /* Opcode */
   VdbeCursor *pC;    /* The cursor to seek */
@@ -5395,7 +5395,7 @@ case OP_Found: {        /* jump, in3, ncycle */
 **
 ** See also: Found, NotFound, NoConflict, SeekRowid
 */
-case OP_SeekRowid: {        /* jump, in3, ncycle */
+case OP_SeekRowid: {        /* jump0, in3, ncycle */
   VdbeCursor *pC;
   BtCursor *pCrsr;
   int res;
@@ -6154,7 +6154,7 @@ case OP_NullRow: {
 ** configured to use Prev, not Next.
 */
 case OP_SeekEnd:             /* ncycle */
-case OP_Last: {              /* jump, ncycle */
+case OP_Last: {              /* jump0, ncycle */
   VdbeCursor *pC;
   BtCursor *pCrsr;
   int res;
@@ -6271,7 +6271,7 @@ case OP_Sort: {        /* jump ncycle */
 ** from the beginning toward the end.  In other words, the cursor is
 ** configured to use Next, not Prev.
 */
-case OP_Rewind: {        /* jump, ncycle */
+case OP_Rewind: {        /* jump0, ncycle */
   VdbeCursor *pC;
   BtCursor *pCrsr;
   int res;
@@ -7279,7 +7279,9 @@ case OP_RowSetTest: {                     /* jump, in1, in3 */
 ** P1 contains the address of the memory cell that contains the first memory
 ** cell in an array of values used as arguments to the sub-program. P2
 ** contains the address to jump to if the sub-program throws an IGNORE
-** exception using the RAISE() function. Register P3 contains the address
+** exception using the RAISE() function. P2 might be zero, if there is
+** no possibility that an IGNORE exception will be raised.
+** Register P3 contains the address
 ** of a memory cell in this (the parent) VM that is used to allocate the
 ** memory required by the sub-vdbe at runtime.
 **
@@ -7287,7 +7289,7 @@ case OP_RowSetTest: {                     /* jump, in1, in3 */
 **
 ** If P5 is non-zero, then recursive program invocation is enabled.
 */
-case OP_Program: {        /* jump */
+case OP_Program: {        /* jump0 */
   int nMem;               /* Number of memory registers for sub-program */
   int nByte;              /* Bytes of runtime space required for sub-program */
   Mem *pRt;               /* Register to allocate runtime space */
@@ -8836,7 +8838,7 @@ case OP_Filter: {          /* jump */
 ** error is encountered.
 */
 case OP_Trace:
-case OP_Init: {          /* jump */
+case OP_Init: {          /* jump0 */
   int i;
 #ifndef SQLITE_OMIT_TRACE
   char *zTrace;
diff --git a/src/vdbeaux.c b/src/vdbeaux.c
index 209d02a049..6519bc9651 100644
--- a/src/vdbeaux.c
+++ b/src/vdbeaux.c
@@ -939,6 +939,14 @@ static void resolveP2Values(Vdbe *p, int *pMaxFuncArgs){
             assert( aLabel!=0 );  /* True because of tag-20230419-1 */
             pOp->p2 = aLabel[ADDR(pOp->p2)];
           }
+
+          /* OPFLG_JUMP opcodes never have P2==0, though OPFLG_JUMP0 opcodes
+          ** might */
+          assert( pOp->p2>0 
+                  || (sqlite3OpcodeProperty[pOp->opcode] & OPFLG_JUMP0)!=0 );
+
+          /* Jumps never go off the end of the bytecode array */
+          assert( pOp->p2<p->nOp );
           break;
         }
       }
diff --git a/tool/mkopcodeh.tcl b/tool/mkopcodeh.tcl
index 6fb3b75940..18fe1a2658 100644
--- a/tool/mkopcodeh.tcl
+++ b/tool/mkopcodeh.tcl
@@ -81,6 +81,7 @@ while {![eof $in]} {
     set op($name) -1
     set group($name) 0
     set jump($name) 0
+    set jump0($name) 0
     set in1($name) 0
     set in2($name) 0
     set in3($name) 0
@@ -109,6 +110,7 @@ while {![eof $in]} {
          out2  {set out2($name) 1}
          out3  {set out3($name) 1}
          ncycle {set ncycle($name) 1}
+         jump0 {set jump($name) 1; set jump0($name) 1;}
        }
     }
     if {$group($name)} {
@@ -137,6 +139,7 @@ puts "/* Automatically generated.  Do not edit */"
 puts "/* See the tool/mkopcodeh.tcl script for details */"
 foreach name {OP_Noop OP_Explain OP_Abortable} {
   set jump($name) 0
+  set jump0($name) 0
   set in1($name) 0
   set in2($name) 0
   set in3($name) 0
@@ -256,7 +259,9 @@ for {set i 0} {$i<=$max} {incr i} {
   set name $def($i)
   puts -nonewline [format {#define %-16s %3d} $name $i]
   set com {}
-  if {[info exists jump($name)] && $jump($name)} {
+  if {[info exists jump0($name)] && $jump0($name)} {
+    lappend com "jump0"
+  } elseif {[info exists jump($name)] && $jump($name)} {
     lappend com "jump"
   }
   if {[info exists sameas($i)]} {
@@ -289,6 +294,7 @@ for {set i 0} {$i<=$max} {incr i} {
     if {$out2($name)}  {incr x 16}
     if {$out3($name)}  {incr x 32}
     if {$ncycle($name)}  {incr x 64}
+    if {$jump0($name)}   {incr x 128}
   }
   set bv($i) $x
 }
@@ -304,6 +310,7 @@ puts "#define OPFLG_IN3         0x08  /* in3:   P3 is an input */"
 puts "#define OPFLG_OUT2        0x10  /* out2:  P2 is an output */"
 puts "#define OPFLG_OUT3        0x20  /* out3:  P3 is an output */"
 puts "#define OPFLG_NCYCLE      0x40  /* ncycle:Cycles count against P1 */"
+puts "#define OPFLG_JUMP0       0x80  /* jump0:  P2 might be zero */"
 puts "#define OPFLG_INITIALIZER \173\\"
 for {set i 0} {$i<=$max} {incr i} {
   if {$i%8==0} {