diff --git a/parser/parser.go b/parser/parser.go
index 7a765c8..5d7bfb3 100644
--- a/parser/parser.go
+++ b/parser/parser.go
@@ -447,6 +447,11 @@ func (p *parser) parseMappingValue(ctx *context) (ast.Node, error) {
 		ntk = p.nextNotCommentToken()
 		antk = p.afterNextNotCommentToken()
 	}
+	if tk := p.nextNotCommentToken(); tk != nil && tk.Position.Line > node.Start.Position.Line && tk.Position.Column > node.Start.Position.Column {
+		// a: b
+		//   c <= this token is invalid.
+		return nil, errors.ErrSyntax("value is not allowed in this context", tk)
+	}
 	if len(node.Values) == 1 {
 		mapKeyCol := mvnode.Key.GetToken().Position.Column
 		commentTk := p.nextToken()
diff --git a/parser/parser_test.go b/parser/parser_test.go
index 6b8b3ae..7adfe77 100644
--- a/parser/parser_test.go
+++ b/parser/parser_test.go
@@ -998,6 +998,44 @@ b
 		},
 		{
 			`
+a: 'b'
+  c: d
+`,
+			`
+[3:3] value is not allowed in this context
+   2 | a: 'b'
+>  3 |   c: d
+         ^
+`,
+		},
+		{
+			`
+a: 'b'
+  - c
+`,
+			`
+[3:3] value is not allowed in this context
+   2 | a: 'b'
+>  3 |   - c
+         ^
+`,
+		},
+		{
+			`
+a: 'b'
+  # comment
+  - c
+`,
+			`
+[4:3] value is not allowed in this context
+   2 | a: 'b'
+   3 |   # comment
+>  4 |   - c
+         ^
+`,
+		},
+		{
+			`
 a: 1
 b
 - c