Index: ext/fts3/fts3_snippet.c
==================================================================
--- ext/fts3/fts3_snippet.c
+++ ext/fts3/fts3_snippet.c
@@ -448,10 +448,13 @@
       sqlite3_tokenizer_module *pMod;
       sqlite3_tokenizer_cursor *pC;
 
       pMod = (sqlite3_tokenizer_module *)pTab->pTokenizer->pModule;
       rc = pMod->xOpen(pTab->pTokenizer, zDoc, nDoc, &pC);
+      if( rc!=SQLITE_OK ){
+        return rc;
+      }
       pC->pTokenizer = pTab->pTokenizer;
       while( rc==SQLITE_OK && iCurrent<(nSnippet+nDesired) ){
         const char *ZDUMMY; int DUMMY1, DUMMY2, DUMMY3;
         rc = pMod->xNext(pC, &ZDUMMY, &DUMMY1, &DUMMY2, &DUMMY3, &iCurrent);
       }