diff --git a/executor/write_test.go b/executor/write_test.go
index 1dc1c9b389ae9..f9f60eaa9889d 100644
--- a/executor/write_test.go
+++ b/executor/write_test.go
@@ -2955,6 +2955,19 @@ func (s *testSerialSuite1) TestIssue20724(c *C) {
 	tk.MustExec("drop table t1")
 }
 
+func (s *testSuite) TestIssue22496(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t12")
+	tk.MustExec("create table t12(d decimal(15,2));")
+	_, err := tk.Exec("insert into t12 values('1,9999.00')")
+	c.Assert(err, NotNil)
+	tk.MustExec("set sql_mode=''")
+	tk.MustExec("insert into t12 values('1,999.00');")
+	tk.MustQuery("SELECT * FROM t12;").Check(testkit.Rows("1.00"))
+	tk.MustExec("drop table t12")
+}
+
 func (s *testSuite) TestIssue21232(c *C) {
 	tk := testkit.NewTestKit(c, s.store)
 	tk.MustExec("use test")
diff --git a/types/convert_test.go b/types/convert_test.go
index 1a2954d9c93e8..082c1d08bde7e 100644
--- a/types/convert_test.go
+++ b/types/convert_test.go
@@ -243,6 +243,15 @@ func (s *testTypeConvertSuite) TestConvertType(c *C) {
 	v, err = Convert("-10000", ft)
 	c.Assert(terror.ErrorEqual(err, ErrOverflow), IsTrue, Commentf("err %v", err))
 	c.Assert(v.(*MyDecimal).String(), Equals, "-9999.9999")
+	v, err = Convert("1,999.00", ft)
+	c.Assert(terror.ErrorEqual(err, ErrBadNumber), IsTrue, Commentf("err %v", err))
+	c.Assert(v.(*MyDecimal).String(), Equals, "1.0000")
+	v, err = Convert("1,999,999.00", ft)
+	c.Assert(terror.ErrorEqual(err, ErrBadNumber), IsTrue, Commentf("err %v", err))
+	c.Assert(v.(*MyDecimal).String(), Equals, "1.0000")
+	v, err = Convert("199.00 ", ft)
+	c.Assert(err, IsNil)
+	c.Assert(v.(*MyDecimal).String(), Equals, "199.0000")
 
 	// Test Datum.ToDecimal with bad number.
 	d := NewDatum("hello")
diff --git a/types/mydecimal.go b/types/mydecimal.go
index 3a04afa7a4bfe..350d2ac3ea153 100644
--- a/types/mydecimal.go
+++ b/types/mydecimal.go
@@ -389,6 +389,8 @@ func (d *MyDecimal) ToString() (str []byte) {
 
 // FromString parses decimal from string.
 func (d *MyDecimal) FromString(str []byte) error {
+	// strErr is used to check str is bad number or not
+	var strErr error
 	for i := 0; i < len(str); i++ {
 		if !isSpace(str[i]) {
 			str = str[i:]
@@ -419,6 +421,8 @@ func (d *MyDecimal) FromString(str []byte) error {
 			endIdx++
 		}
 		digitsFrac = endIdx - strIdx - 1
+	} else if strIdx < len(str) && (str[strIdx] != 'e' && str[strIdx] != 'E' && str[strIdx] != ' ') {
+		strErr = ErrBadNumber
 	} else {
 		digitsFrac = 0
 		endIdx = strIdx
@@ -519,6 +523,9 @@ func (d *MyDecimal) FromString(str []byte) error {
 		d.negative = false
 	}
 	d.resultFrac = d.digitsFrac
+	if strErr != nil {
+		return strErr
+	}
 	return err
 }