Index: src/build.c
==================================================================
--- src/build.c
+++ src/build.c
@@ -1963,10 +1963,11 @@
       sqlite3VdbeAddOp3(v, OP_OpenWrite, 1, pParse->regRoot, iDb);
       sqlite3VdbeChangeP5(v, OPFLAG_P2ISREG);
       pParse->nTab = 2;
       addrTop = sqlite3VdbeCurrentAddr(v) + 1;
       sqlite3VdbeAddOp3(v, OP_InitCoroutine, regYield, 0, addrTop);
+      if( pParse->nErr ) return;
       pSelTab = sqlite3ResultSetOfSelect(pParse, pSelect);
       if( pSelTab==0 ) return;
       assert( p->aCol==0 );
       p->nCol = pSelTab->nCol;
       p->aCol = pSelTab->aCol;

Index: test/colname.test
==================================================================
--- test/colname.test
+++ test/colname.test
@@ -395,10 +395,20 @@
 } {Bbb 123}
 do_execsql_test colname-9.320 {
   CREATE TABLE t2 AS SELECT BBb FROM (SELECT aaa AS Bbb FROM t1);
   SELECT name FROM pragma_table_info('t2');
 } {Bbb}
+
+# Issue detected by clusterfuzz on 2017-12-24 (Christmas Eve)
+# caused by check-in https://sqlite.org/src/info/6b2ff26c25
+#
+# Prior to being fixed, the following CREATE TABLE was dereferencing
+# a NULL pointer and segfaulting.
+#
+do_catchsql_test colname-9.400 {
+  CREATE TABLE t4 AS SELECT #0;
+} {1 {near "#0": syntax error}}
 
 
 # Make sure the quotation marks get removed from the column names
 # when constructing a new table from an aggregate SELECT.
 # Email from Juergen Palm on 2017-07-11.