Index: src/where.c
==================================================================
--- src/where.c
+++ src/where.c
@@ -4445,11 +4445,11 @@
           sqlite3WhereEnd(pSubWInfo);
         }
       }
     }
     pLevel->u.pCovidx = pCov;
-    pLevel->iIdxCur = iCovCur;
+    if( pCov ) pLevel->iIdxCur = iCovCur;
     if( pAndExpr ){
       pAndExpr->pLeft = 0;
       sqlite3ExprDelete(pParse->db, pAndExpr);
     }
     sqlite3VdbeChangeP1(v, iRetInit, sqlite3VdbeCurrentAddr(v));

Index: test/whereD.test
==================================================================
--- test/whereD.test
+++ test/whereD.test
@@ -158,7 +158,32 @@
   SELECT a, b FROM t3 WHERE (a=1 AND b='one') OR rowid=4
 } {1 one 2 two search 2}
 do_searchcount_test 3.5.2 {
   SELECT a, c FROM t3 WHERE (a=1 AND b='one') OR rowid=4
 } {1 i 2 ii search 2}
+
+# Ticket [d02e1406a58ea02d] (2012-10-04)
+# LEFT JOIN with an OR in the ON clause causes segfault 
+#
+do_test 4.1 {
+  db eval {
+    CREATE TABLE t41(a,b,c);
+    INSERT INTO t41 VALUES(1,2,3), (4,5,6);
+    CREATE TABLE t42(d,e,f);
+    INSERT INTO t42 VALUES(3,6,9), (4,8,12);
+    SELECT * FROM t41 AS x LEFT JOIN t42 AS y ON (y.d=x.c) OR (y.e=x.b);
+  }
+} {1 2 3 3 6 9 4 5 6 {} {} {}}
+do_test 4.2 {
+  db eval {
+    CREATE INDEX t42d ON t42(d);
+    CREATE INDEX t42e ON t42(e);
+    SELECT * FROM t41 AS x LEFT JOIN t42 AS y ON (y.d=x.c) OR (y.e=x.b);
+  }
+} {1 2 3 3 6 9 4 5 6 {} {} {}}
+do_test 4.2 {
+  db eval {
+    SELECT * FROM t41 AS x LEFT JOIN t42 AS y ON (y.d=x.c) OR (y.d=x.b);
+  }
+} {1 2 3 3 6 9 4 5 6 {} {} {}}
 
 finish_test