Index: src/update.c
==================================================================
--- src/update.c
+++ src/update.c
@@ -728,10 +728,11 @@
       if( pPk ){
         sqlite3VdbeAddOp4Int(v, OP_NotFound,iDataCur,labelContinue,regKey,nKey);
       }else{
         sqlite3VdbeAddOp3(v, OP_NotExists, iDataCur, labelContinue,regOldRowid);
       }
+      VdbeCoverageNeverTaken(v);
     }
 
     /* Do FK constraint checks. */
     if( hasFK ){
       sqlite3FkCheck(pParse, pTab, regOldRowid, 0, aXRef, chngKey);