Index: src/vdbemem.c
==================================================================
--- src/vdbemem.c
+++ src/vdbemem.c
@@ -153,11 +153,11 @@
   testcase( bPreserve && pMem->z==0 );
 
   assert( pMem->szMalloc==0
        || pMem->szMalloc==sqlite3DbMallocSize(pMem->db, pMem->zMalloc) );
   if( n<32 ) n = 32;
-  if( bPreserve && pMem->szMalloc>0 && pMem->z==pMem->zMalloc ){
+  if( pMem->szMalloc>0 && bPreserve && pMem->z==pMem->zMalloc ){
     pMem->z = pMem->zMalloc = sqlite3DbReallocOrFree(pMem->db, pMem->z, n);
     bPreserve = 0;
   }else{
     if( pMem->szMalloc>0 ) sqlite3DbFreeNN(pMem->db, pMem->zMalloc);
     pMem->zMalloc = sqlite3DbMallocRaw(pMem->db, n);
@@ -169,11 +169,12 @@
     return SQLITE_NOMEM_BKPT;
   }else{
     pMem->szMalloc = sqlite3DbMallocSize(pMem->db, pMem->zMalloc);
   }
 
-  if( bPreserve && pMem->z && ALWAYS(pMem->z!=pMem->zMalloc) ){
+  if( bPreserve && pMem->z ){
+    assert( pMem->z!=pMem->zMalloc );
     memcpy(pMem->zMalloc, pMem->z, pMem->n);
   }
   if( (pMem->flags&MEM_Dyn)!=0 ){
     assert( pMem->xDel!=0 && pMem->xDel!=SQLITE_DYNAMIC );
     pMem->xDel((void *)(pMem->z));