Index: src/build.c
==================================================================
--- src/build.c
+++ src/build.c
@@ -2788,11 +2788,11 @@
   Token *pName = 0;    /* Unqualified name of the index to create */
   struct ExprList_item *pListItem; /* For looping over pList */
   const Column *pTabCol;           /* A column in the table */
   int nExtra = 0;                  /* Space allocated for zExtra[] */
   int nExtraCol;                   /* Number of extra columns needed */
-  char *zExtra;                    /* Extra space after the Index object */
+  char *zExtra = 0;                /* Extra space after the Index object */
   Index *pPk = 0;      /* PRIMARY KEY index for WITHOUT ROWID tables */
 
   assert( pParse->nErr==0 );      /* Never called with prior errors */
   if( db->mallocFailed || IN_DECLARE_VTAB ){
     goto exit_create_index;