diff --git a/executor/executor.go b/executor/executor.go
index 8215c723a2dab..4eb6c7f9f0413 100644
--- a/executor/executor.go
+++ b/executor/executor.go
@@ -1706,6 +1706,10 @@ func FillVirtualColumnValue(virtualRetTypes []*types.FieldType, virtualColumnInd
 			if err != nil {
 				return err
 			}
+			// Handle the bad null error.
+			if (mysql.HasNotNullFlag(columns[idx].Flag) || mysql.HasPreventNullInsertFlag(columns[idx].Flag)) && castDatum.IsNull() {
+				castDatum = table.GetZeroValue(columns[idx])
+			}
 			virCols.AppendDatum(i, &castDatum)
 		}
 		req.SetCol(idx, virCols.Column(i))
diff --git a/executor/union_scan.go b/executor/union_scan.go
index 43f316b785cdd..cdc13e19c8f8b 100644
--- a/executor/union_scan.go
+++ b/executor/union_scan.go
@@ -19,6 +19,7 @@ import (
 	"runtime/trace"
 
 	"github.com/pingcap/parser/model"
+	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/tidb/expression"
 	"github.com/pingcap/tidb/kv"
 	plannercore "github.com/pingcap/tidb/planner/core"
@@ -134,6 +135,10 @@ func (us *UnionScanExec) Next(ctx context.Context, req *chunk.Chunk) error {
 			if err != nil {
 				return err
 			}
+			// Handle the bad null error.
+			if (mysql.HasNotNullFlag(us.columns[idx].Flag) || mysql.HasPreventNullInsertFlag(us.columns[idx].Flag)) && castDatum.IsNull() {
+				castDatum = table.GetZeroValue(us.columns[idx])
+			}
 			mutableRow.SetDatum(idx, castDatum)
 		}
 
diff --git a/expression/integration_test.go b/expression/integration_test.go
index 54fed7610f487..a54be29493365 100755
--- a/expression/integration_test.go
+++ b/expression/integration_test.go
@@ -7330,6 +7330,21 @@ func (s *testIntegrationSerialSuite) TestIssue18949(c *C) {
 	c.Assert(result, Matches, `(?s).*enum\('a','b	',' c'\).*set\('a','b	',' c'\).*`)
 }
 
+func (s *testIntegrationSuite) TestIssue17767(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t0;")
+	tk.MustExec("CREATE TABLE t0(c0 INTEGER AS (NULL) NOT NULL, c1 INT);")
+	tk.MustExec("CREATE INDEX i0 ON t0(c0, c1);")
+	tk.MustExec("INSERT IGNORE INTO t0(c1) VALUES (0);")
+	tk.MustQuery("SELECT * FROM t0").Check(testkit.Rows("0 0"))
+
+	tk.MustExec("begin")
+	tk.MustExec("INSERT IGNORE INTO t0(c1) VALUES (0);")
+	tk.MustQuery("SELECT * FROM t0").Check(testkit.Rows("0 0", "0 0"))
+	tk.MustExec("rollback")
+}
+
 func (s *testIntegrationSuite) TestIssue19596(c *C) {
 	tk := testkit.NewTestKit(c, s.store)
 	tk.MustExec("use test")