Index: src/where.c
==================================================================
--- src/where.c
+++ src/where.c
@@ -5082,12 +5082,14 @@
       sqlite3VdbeResolveLabel(v, pLevel->addrNxt);
       for(j=pLevel->u.in.nIn, pIn=&pLevel->u.in.aInLoop[j-1]; j>0; j--, pIn--){
         sqlite3VdbeJumpHere(v, pIn->addrInTop+1);
         if( pIn->eEndLoopOp!=OP_Noop ){
           if( pIn->nPrefix ){
-            sqlite3VdbeAddOp3(v, OP_Noop, pLevel->iIdxCur,
+            sqlite3VdbeAddOp4Int(v, OP_NotFound, pLevel->iIdxCur,
+                              sqlite3VdbeCurrentAddr(v)+2,
                               pIn->iBase, pIn->nPrefix);
+            VdbeCoverage(v);
           }
           sqlite3VdbeAddOp2(v, pIn->eEndLoopOp, pIn->iCur, pIn->addrInTop);
           VdbeCoverage(v);
           VdbeCoverageIf(v, pIn->eEndLoopOp==OP_PrevIfOpen);
           VdbeCoverageIf(v, pIn->eEndLoopOp==OP_NextIfOpen);

Index: src/wherecode.c
==================================================================
--- src/wherecode.c
+++ src/wherecode.c
@@ -590,12 +590,16 @@
           }
           sqlite3VdbeAddOp1(v, OP_IsNull, iOut); VdbeCoverage(v);
           if( i==iEq ){
             pIn->iCur = iTab;
             pIn->eEndLoopOp = bRev ? OP_PrevIfOpen : OP_NextIfOpen;
-            pIn->iBase = iReg - i;
-            pIn->nPrefix = i;
+            if( (pLoop->wsFlags & WHERE_VIRTUALTABLE)==0 ){
+              pIn->iBase = iReg - i;
+              pIn->nPrefix = i;
+            }else{
+              pIn->nPrefix = 0;
+            }
           }else{
             pIn->eEndLoopOp = OP_Noop;
           }
           pIn++;
         }