diff --git a/cli/pkg/kctrl/cmd/package/release/schemagenerator/helm_openapi_schema_gen.go b/cli/pkg/kctrl/cmd/package/release/schemagenerator/helm_openapi_schema_gen.go
index 373af5f9e..7a1e9e988 100644
--- a/cli/pkg/kctrl/cmd/package/release/schemagenerator/helm_openapi_schema_gen.go
+++ b/cli/pkg/kctrl/cmd/package/release/schemagenerator/helm_openapi_schema_gen.go
@@ -26,6 +26,7 @@ const (
 	itemsKey       = "items"
 	propertiesKey  = "properties"
 	defaultKey     = "default"
+	nullableKey    = "nullable"
 )
 
 var keyOrder = map[string]int{
@@ -35,6 +36,7 @@ var keyOrder = map[string]int{
 	itemsKey:       4,
 	propertiesKey:  5,
 	defaultKey:     6,
+	nullableKey:    7,
 }
 
 const (
@@ -51,6 +53,43 @@ const (
 	floatTag = "!!float"
 )
 
+var any = &MapItem{
+	Key: "oneOf",
+	Value: []map[string]interface{}{
+		{
+			typeKey:     "integer",
+			defaultKey:  nil,
+			nullableKey: true,
+		},
+		{
+			typeKey:     "number",
+			defaultKey:  nil,
+			nullableKey: true,
+		},
+		{
+			typeKey:     "boolean",
+			defaultKey:  nil,
+			nullableKey: true,
+		},
+		{
+			typeKey:     "string",
+			defaultKey:  nil,
+			nullableKey: true,
+		},
+		{
+			typeKey:     "object",
+			defaultKey:  nil,
+			nullableKey: true,
+		},
+		{
+			typeKey:     "array",
+			defaultKey:  nil,
+			nullableKey: true,
+			itemsKey:    map[string]string{},
+		},
+	},
+}
+
 type MapItem struct {
 	Key   string
 	Value interface{}
@@ -211,10 +250,14 @@ func (h HelmValuesSchemaGen) calculateProperties(key *yaml3.Node, value *yaml3.N
 		if err != nil {
 			return nil, err
 		}
-		apiKeys = append(apiKeys, &MapItem{Key: typeKey, Value: h.openAPIType(value.Tag, value.Value)})
-		apiKeys = append(apiKeys, &MapItem{Key: defaultKey, Value: defaultVal})
-		if value.Tag == floatTag {
-			apiKeys = append(apiKeys, &MapItem{Key: formatKey, Value: floatVal})
+		if value.Tag == nullTag {
+			apiKeys = append(apiKeys, any)
+		} else {
+			apiKeys = append(apiKeys, &MapItem{Key: typeKey, Value: h.openAPIType(value.Tag, value.Value)})
+			apiKeys = append(apiKeys, &MapItem{Key: defaultKey, Value: defaultVal})
+			if value.Tag == floatTag {
+				apiKeys = append(apiKeys, &MapItem{Key: formatKey, Value: floatVal})
+			}
 		}
 	case yaml3.AliasNode:
 		return h.calculateProperties(key, value.Alias)
@@ -266,7 +309,6 @@ func (h HelmValuesSchemaGen) openAPIType(tag, value string) string {
 		}
 	}
 	return "string"
-
 }
 
 func (h HelmValuesSchemaGen) getDefaultValue(tag, value string) (interface{}, error) {
diff --git a/cli/pkg/kctrl/cmd/package/release/schemagenerator/helm_openapi_schema_gen_test.go b/cli/pkg/kctrl/cmd/package/release/schemagenerator/helm_openapi_schema_gen_test.go
index fb0d8446c..58c7c4672 100644
--- a/cli/pkg/kctrl/cmd/package/release/schemagenerator/helm_openapi_schema_gen_test.go
+++ b/cli/pkg/kctrl/cmd/package/release/schemagenerator/helm_openapi_schema_gen_test.go
@@ -69,7 +69,8 @@ arrKeyEmpty: []
       type: string
     type: array
 type: object
-`},
+`,
+		},
 		{
 			name: "object with different values",
 			input: `
@@ -123,7 +124,8 @@ objExample: {}
     description: Object example
     type: object
 type: object
-`},
+`,
+		},
 		{
 			name: "nested complex object",
 			input: `
@@ -176,7 +178,8 @@ containers:
         type: string
     type: object
 type: object
-`},
+`,
+		},
 		{
 			name: "Alias Node",
 			input: `
@@ -223,7 +226,40 @@ aliasEx:
       type: object
     type: array
 type: object
-`},
+`,
+		},
+		{
+			name: "unknown type",
+			input: `
+# a field without a type
+anything: null
+`,
+			want: `properties:
+  anything:
+    description: a field without a type
+    oneOf:
+    - default: null
+      nullable: true
+      type: integer
+    - default: null
+      nullable: true
+      type: number
+    - default: null
+      nullable: true
+      type: boolean
+    - default: null
+      nullable: true
+      type: string
+    - default: null
+      nullable: true
+      type: object
+    - default: null
+      items: {}
+      nullable: true
+      type: array
+type: object
+`,
+		},
 	}
 
 	for _, test := range tests {