Index: src/build.c
==================================================================
--- src/build.c
+++ src/build.c
@@ -2760,10 +2760,11 @@
     tnum = memRootPage;
   }else{
     tnum = pIndex->tnum;
   }
   pKey = sqlite3KeyInfoOfIndex(pParse, pIndex);
+  assert( pKey!=0 || db->mallocFailed || pParse->nErr );
 
   /* Open the sorter cursor if we are to use one. */
   iSorter = pParse->nTab++;
   sqlite3VdbeAddOp4(v, OP_SorterOpen, iSorter, 0, pIndex->nKeyCol, (char*)
                     sqlite3KeyInfoRef(pKey), P4_KEYINFO);
@@ -2783,12 +2784,11 @@
   sqlite3VdbeAddOp4(v, OP_OpenWrite, iIdx, tnum, iDb, 
                     (char *)pKey, P4_KEYINFO);
   sqlite3VdbeChangeP5(v, OPFLAG_BULKCSR|((memRootPage>=0)?OPFLAG_P2ISREG:0));
 
   addr1 = sqlite3VdbeAddOp2(v, OP_SorterSort, iSorter, 0); VdbeCoverage(v);
-  assert( pKey!=0 || db->mallocFailed || pParse->nErr );
-  if( IsUniqueIndex(pIndex) /*&& pKey!=0*/ ){
+  if( IsUniqueIndex(pIndex) ){
     int j2 = sqlite3VdbeCurrentAddr(v) + 3;
     sqlite3VdbeGoto(v, j2);
     addr2 = sqlite3VdbeCurrentAddr(v);
     sqlite3VdbeAddOp4Int(v, OP_SorterCompare, iSorter, j2, regRecord,
                          pIndex->nKeyCol); VdbeCoverage(v);