Index: src/insert.c
==================================================================
--- src/insert.c
+++ src/insert.c
@@ -647,12 +647,11 @@
     sqlite3SelectDestInit(&dest, SRT_Coroutine, regYield);
     dest.iSdst = bIdListInOrder ? regData : 0;
     dest.nSdst = pTab->nCol;
     rc = sqlite3Select(pParse, pSelect, &dest);
     regFromSelect = dest.iSdst;
-    assert( pParse->nErr==0 || rc );
-    if( rc || db->mallocFailed ) goto insert_cleanup;
+    if( rc || db->mallocFailed || pParse->nErr ) goto insert_cleanup;
     sqlite3VdbeAddOp1(v, OP_EndCoroutine, regYield);
     sqlite3VdbeJumpHere(v, addrTop - 1);                       /* label B: */
     assert( pSelect->pEList );
     nColumn = pSelect->pEList->nExpr;
 

Index: test/insert4.test
==================================================================
--- test/insert4.test
+++ test/insert4.test
@@ -558,7 +558,12 @@
     INSERT INTO t1 SELECT * FROM t2;
     SELECT * FROM t1;
   }
 } {1 3}
 
+do_catchsql_test insert4-9.1 {
+  DROP TABLE IF EXISTS t1;
+  CREATE TABLE t1(x);
+  INSERT INTO t1(x) VALUES(5 COLLATE xyzzy) UNION SELECT 0;
+} {1 {no such collation sequence: xyzzy}}
 
 finish_test