Index: src/build.c
==================================================================
--- src/build.c
+++ src/build.c
@@ -1868,12 +1868,10 @@
   }
   assert( !db->mallocFailed );
   p = pParse->pNewTable;
   if( p==0 ) return;
 
-  assert( !db->init.busy || !pSelect );
-
   /* If the db->init.busy is 1 it means we are reading the SQL off the
   ** "sqlite_master" or "sqlite_temp_master" table on the disk.
   ** So do not write to the disk again.  Extract the root page number
   ** for the table from the db->init.newTnum field.  (The page number
   ** should have been put there by the sqliteOpenCb routine.)
@@ -1880,10 +1878,14 @@
   **
   ** If the root page number is 1, that means this is the sqlite_master
   ** table itself.  So mark it read-only.
   */
   if( db->init.busy ){
+    if( pSelect ){
+      sqlite3ErrorMsg(pParse, "");
+      return;
+    }
     p->tnum = db->init.newTnum;
     if( p->tnum==1 ) p->tabFlags |= TF_Readonly;
   }
 
   /* Special processing for WITHOUT ROWID Tables */

Index: src/prepare.c
==================================================================
--- src/prepare.c
+++ src/prepare.c
@@ -27,11 +27,11 @@
   sqlite3 *db = pData->db;
   if( !db->mallocFailed && (db->flags & SQLITE_WriteSchema)==0 ){
     char *z;
     if( zObj==0 ) zObj = "?";
     z = sqlite3MPrintf(db, "malformed database schema (%s)", zObj);
-    if( zExtra ) z = sqlite3MPrintf(db, "%z - %s", z, zExtra);
+    if( zExtra && zExtra[0] ) z = sqlite3MPrintf(db, "%z - %s", z, zExtra);
     sqlite3DbFree(db, *pData->pzErrMsg);
     *pData->pzErrMsg = z;
   }
   pData->rc = db->mallocFailed ? SQLITE_NOMEM_BKPT : SQLITE_CORRUPT_BKPT;
 }