diff --git a/datamodel/high/node_builder.go b/datamodel/high/node_builder.go
index 3b064a86..f2de0773 100644
--- a/datamodel/high/node_builder.go
+++ b/datamodel/high/node_builder.go
@@ -193,7 +193,9 @@ func (n *NodeBuilder) add(key string, i int) {
 			sort.Slice(lines, func(i, j int) bool {
 				return lines[i] < lines[j]
 			})
-			nodeEntry.Line = lines[0]
+			if len(lines) > 0 {
+				nodeEntry.Line = lines[0]
+			}
 		case reflect.Struct:
 			y := value.Interface()
 			nodeEntry.Line = 9999 + i
@@ -394,7 +396,9 @@ func (n *NodeBuilder) AddYAMLNode(parent *yaml.Node, entry *nodes.NodeEntry) *ya
 					vn := vnut.GetValueNode()
 					if vn.Kind == yaml.SequenceNode {
 						for i := range vn.Content {
-							rawNode.Content[i].Style = vn.Content[i].Style
+							if len(rawNode.Content) > i {
+								rawNode.Content[i].Style = vn.Content[i].Style
+							}
 						}
 					}
 				}
diff --git a/datamodel/high/node_builder_test.go b/datamodel/high/node_builder_test.go
index 81526426..74f93e93 100644
--- a/datamodel/high/node_builder_test.go
+++ b/datamodel/high/node_builder_test.go
@@ -49,6 +49,12 @@ func (r valueReferenceStruct) GoLowUntyped() any {
 	return &r
 }
 
+func (r valueReferenceStruct) GetValueNode() *yaml.Node {
+	n := utils.CreateEmptySequenceNode()
+	n.Content = append(n.Content, utils.CreateEmptySequenceNode())
+	return n
+}
+
 type plug struct {
 	Name []string `yaml:"name,omitempty"`
 }
@@ -117,11 +123,103 @@ func (te *test1) GetKeyNode() *yaml.Node {
 	return kn
 }
 
+func (te *test1) GetValueNode() *yaml.Node {
+	kn := utils.CreateStringNode("meddy")
+	kn.Line = 20
+	return kn
+}
+
 func (te *test1) GoesLowUntyped() any {
 	panic("GoesLowUntyped")
 	return te
 }
 
+type test2 struct {
+	Thrat      *valueReferenceStruct                             `yaml:"throg,omitempty"`
+	Thrig      *orderedmap.Map[string, *plug]                    `yaml:"thrig,omitempty"`
+	Thing      string                                            `yaml:"thing,omitempty"`
+	Thong      int                                               `yaml:"thong,omitempty"`
+	Thrum      int64                                             `yaml:"thrum,omitempty"`
+	Thang      float32                                           `yaml:"thang,omitempty"`
+	Thung      float64                                           `yaml:"thung,omitempty"`
+	Thyme      bool                                              `yaml:"thyme,omitempty"`
+	Thurm      any                                               `yaml:"thurm,omitempty"`
+	Thugg      *bool                                             `yaml:"thugg,renderZero"`
+	Thurr      *int64                                            `yaml:"thurr,omitempty"`
+	Thral      *float64                                          `yaml:"thral,omitempty"`
+	Throo      *float64                                          `yaml:"throo,renderZero,omitempty"`
+	Tharg      []string                                          `yaml:"tharg,omitempty"`
+	Type       []string                                          `yaml:"type,omitempty"`
+	Throg      []*valueReferenceStruct                           `yaml:"throg,omitempty"`
+	Throj      *valueReferenceStruct                             `yaml:"throg,omitempty"`
+	Thrag      []*orderedmap.Map[string, []string]               `yaml:"thrag,omitempty"`
+	Thrug      *orderedmap.Map[string, string]                   `yaml:"thrug,omitempty"`
+	Thoom      []*orderedmap.Map[string, string]                 `yaml:"thoom,omitempty"`
+	Thomp      *orderedmap.Map[low.KeyReference[string], string] `yaml:"thomp,omitempty"`
+	Thump      valueReferenceStruct                              `yaml:"thump,omitempty"`
+	Thane      valueReferenceStruct                              `yaml:"thane,omitempty"`
+	Thunk      valueReferenceStruct                              `yaml:"thunk,omitempty"`
+	Thrim      *valueReferenceStruct                             `yaml:"thrim,omitempty"`
+	Thril      *orderedmap.Map[string, *valueReferenceStruct]    `yaml:"thril,omitempty"`
+	Extensions *orderedmap.Map[string, *yaml.Node]               `yaml:"-"`
+	ignoreMe   string                                            `yaml:"-"`
+	IgnoreMe   string                                            `yaml:"-"`
+}
+
+func (t test2) IsReference() bool {
+	return true
+}
+
+func (t test2) GetReference() string {
+	return "aggghhh"
+}
+
+func (t test2) SetReference(ref string, _ *yaml.Node) {
+
+}
+
+func (t test2) GetReferenceNode() *yaml.Node {
+	return nil
+}
+
+func (t test2) MarshalYAML() (interface{}, error) {
+	return utils.CreateStringNode("pizza"), nil
+}
+
+func (t test2) MarshalYAMLInline() (interface{}, error) {
+	return utils.CreateStringNode("pizza-inline!"), nil
+}
+
+func (t test2) GoLowUntyped() any {
+	return &t
+}
+
+func (t test2) GetValue() *yaml.Node {
+	return nil
+}
+
+func TestNewNodeBuilder_SliceRef_Inline_HasValue(t *testing.T) {
+	ty := []interface{}{utils.CreateEmptySequenceNode()}
+	t1 := test1{
+		Thrat: ty,
+	}
+
+	t2 := test2{
+		Thrat: &valueReferenceStruct{Value: renderZero},
+	}
+
+	nb := NewNodeBuilder(&t1, &t2)
+	nb.Resolve = true
+	node := nb.Render()
+
+	data, _ := yaml.Marshal(node)
+
+	desired := `thrat:
+    - []`
+
+	assert.Equal(t, desired, strings.TrimSpace(string(data)))
+}
+
 func TestNewNodeBuilder(t *testing.T) {
 	b := true
 	c := int64(12345)
@@ -606,6 +704,27 @@ func TestNewNodeBuilder_SliceRef_Inline(t *testing.T) {
 	assert.Equal(t, desired, strings.TrimSpace(string(data)))
 }
 
+func TestNewNodeBuilder_SliceRef_InlineNull(t *testing.T) {
+	c := valueReferenceStruct{Value: "milky"}
+	ty := []*valueReferenceStruct{&c}
+	t1 := test1{
+		Throg: ty,
+	}
+
+	t2 := test1{
+		Throg: []*valueReferenceStruct{},
+	}
+
+	nb := NewNodeBuilder(&t1, &t2)
+	node := nb.Render()
+
+	data, _ := yaml.Marshal(node)
+
+	desired := "throg:\n    - pizza"
+
+	assert.Equal(t, desired, strings.TrimSpace(string(data)))
+}
+
 type testRender struct{}
 
 func (t testRender) MarshalYAML() (interface{}, error) {
diff --git a/datamodel/spec_info.go b/datamodel/spec_info.go
index a4dd60b6..904cbd5a 100644
--- a/datamodel/spec_info.go
+++ b/datamodel/spec_info.go
@@ -114,6 +114,7 @@ func ExtractSpecInfoWithDocumentCheck(spec []byte, bypass bool) (*SpecInfo, erro
 			case "3.1.0", "3.1":
 				specInfo.VersionNumeric = 3.1
 				specInfo.APISchema = OpenAPI31SchemaData
+				specInfo.SpecFormat = OAS31
 			default:
 				specInfo.VersionNumeric = 3.0
 				specInfo.APISchema = OpenAPI3SchemaData
diff --git a/document.go b/document.go
index 98aa9f42..5164247b 100644
--- a/document.go
+++ b/document.go
@@ -296,7 +296,7 @@ func (d *document) BuildV3Model() (*DocumentModel[v3high.Document], []error) {
 		errs = append(errs, fmt.Errorf("unable to build document, no specification has been loaded"))
 		return nil, errs
 	}
-	if d.info.SpecFormat != datamodel.OAS3 {
+	if d.info.SpecFormat != datamodel.OAS3 && d.info.SpecFormat != datamodel.OAS31 {
 		errs = append(errs, fmt.Errorf("unable to build openapi document, "+
 			"supplied spec is a different version (%v). Try 'BuildV2Model()'", d.info.SpecFormat))
 		return nil, errs
diff --git a/index/spec_index_test.go b/index/spec_index_test.go
index d63ea04b..3ed625a6 100644
--- a/index/spec_index_test.go
+++ b/index/spec_index_test.go
@@ -190,7 +190,7 @@ func TestSpecIndex_DigitalOcean(t *testing.T) {
 	// get all the files!
 	files := remoteFS.GetFiles()
 	fileLen := len(files)
-	assert.Equal(t, 1654, fileLen)
+	assert.Equal(t, 1658, fileLen)
 	assert.Len(t, remoteFS.GetErrors(), 0)
 
 	// check circular references