diff --git a/expression/builtin_json.go b/expression/builtin_json.go
index 0d7844ec02..444a03bc24 100644
--- a/expression/builtin_json.go
+++ b/expression/builtin_json.go
@@ -1268,7 +1268,7 @@ func (b *builtinJSONKeysSig) evalJSON(row chunk.Row) (res json.BinaryJSON, isNul
 		return res, isNull, err
 	}
 	if res.TypeCode != json.TypeCodeObject {
-		return res, true, json.ErrInvalidJSONData
+		return res, true, nil
 	}
 	return res.GetKeys(), false, nil
 }
@@ -1288,9 +1288,6 @@ func (b *builtinJSONKeys2ArgsSig) evalJSON(row chunk.Row) (res json.BinaryJSON,
 	if isNull || err != nil {
 		return res, isNull, err
 	}
-	if res.TypeCode != json.TypeCodeObject {
-		return res, true, json.ErrInvalidJSONData
-	}
 
 	path, isNull, err := b.args[1].EvalString(b.ctx, row)
 	if isNull || err != nil {
diff --git a/expression/builtin_json_test.go b/expression/builtin_json_test.go
index dd5bda1c1d..ff61d7899b 100644
--- a/expression/builtin_json_test.go
+++ b/expression/builtin_json_test.go
@@ -579,6 +579,7 @@ func (s *testEvaluatorSuite) TestJSONKeys(c *C) {
 		expected interface{}
 		success  bool
 	}{
+
 		// Tests nil arguments
 		{[]interface{}{nil}, nil, true},
 		{[]interface{}{nil, "$.c"}, nil, true},
@@ -586,12 +587,12 @@ func (s *testEvaluatorSuite) TestJSONKeys(c *C) {
 		{[]interface{}{nil, nil}, nil, true},
 
 		// Tests with other type
-		{[]interface{}{`1`}, nil, false},
-		{[]interface{}{`"str"`}, nil, false},
-		{[]interface{}{`true`}, nil, false},
-		{[]interface{}{`null`}, nil, false},
-		{[]interface{}{`[1, 2]`}, nil, false},
-		{[]interface{}{`["1", "2"]`}, nil, false},
+		{[]interface{}{`1`}, nil, true},
+		{[]interface{}{`"str"`}, nil, true},
+		{[]interface{}{`true`}, nil, true},
+		{[]interface{}{`null`}, nil, true},
+		{[]interface{}{`[1, 2]`}, nil, true},
+		{[]interface{}{`["1", "2"]`}, nil, true},
 
 		// Tests without path expression
 		{[]interface{}{`{}`}, `[]`, true},
diff --git a/expression/builtin_json_vec.go b/expression/builtin_json_vec.go
index 893f4c1118..430d16ecaf 100644
--- a/expression/builtin_json_vec.go
+++ b/expression/builtin_json_vec.go
@@ -152,7 +152,8 @@ func (b *builtinJSONKeysSig) vecEvalJSON(input *chunk.Chunk, result *chunk.Colum
 
 		j = buf.GetJSON(i)
 		if j.TypeCode != json.TypeCodeObject {
-			return json.ErrInvalidJSONData
+			result.AppendNull()
+			continue
 		}
 		result.AppendJSON(j.GetKeys())
 	}
@@ -522,10 +523,6 @@ func (b *builtinJSONKeys2ArgsSig) vecEvalJSON(input *chunk.Chunk, result *chunk.
 			continue
 		}
 
-		jsonItem := jsonBuf.GetJSON(i)
-		if jsonItem.TypeCode != json.TypeCodeObject {
-			return json.ErrInvalidJSONData
-		}
 		pathExpr, err := json.ParseJSONPathExpr(pathBuf.GetString(i))
 		if err != nil {
 			return err
@@ -534,6 +531,12 @@ func (b *builtinJSONKeys2ArgsSig) vecEvalJSON(input *chunk.Chunk, result *chunk.
 			return json.ErrInvalidJSONPathWildcard
 		}
 
+		jsonItem := jsonBuf.GetJSON(i)
+		if jsonItem.TypeCode != json.TypeCodeObject {
+			result.AppendNull()
+			continue
+		}
+
 		res, exists := jsonItem.Extract([]json.PathExpression{pathExpr})
 		if !exists || res.TypeCode != json.TypeCodeObject {
 			result.AppendNull()
diff --git a/expression/integration_test.go b/expression/integration_test.go
index 551640867d..21bf93d1ca 100755
--- a/expression/integration_test.go
+++ b/expression/integration_test.go
@@ -4058,13 +4058,13 @@ func (s *testIntegrationSuite) TestFuncJSON(c *C) {
 	r.Check(testkit.Rows("1 0 1 0"))
 
 	r = tk.MustQuery(`select
-
+		json_keys('[]'),
 		json_keys('{}'),
 		json_keys('{"a": 1, "b": 2}'),
 		json_keys('{"a": {"c": 3}, "b": 2}'),
 		json_keys('{"a": {"c": 3}, "b": 2}', "$.a")
 	`)
-	r.Check(testkit.Rows(`[] ["a", "b"] ["a", "b"] ["c"]`))
+	r.Check(testkit.Rows(`<nil> [] ["a", "b"] ["a", "b"] ["c"]`))
 
 	r = tk.MustQuery(`select
 		json_length('1'),