diff --git a/HandyJSON.xcodeproj/project.pbxproj b/HandyJSON.xcodeproj/project.pbxproj
index 7913ee0..507a225 100644
--- a/HandyJSON.xcodeproj/project.pbxproj
+++ b/HandyJSON.xcodeproj/project.pbxproj
@@ -1323,7 +1323,7 @@
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = "$(SRCROOT)/Source/Info-iOS.plist";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.aliyun.app.HandyJSON;
 				PRODUCT_NAME = "$(PROJECT_NAME)";
@@ -1347,7 +1347,7 @@
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = "$(SRCROOT)/Source/Info-iOS.plist";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.aliyun.app.HandyJSON;
 				PRODUCT_NAME = "$(PROJECT_NAME)";
@@ -1366,7 +1366,7 @@
 				DEVELOPMENT_TEAM = QBMN2BBW3K;
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = HandyJSONDemo/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.aliyun.app.HandyJSONDemo;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -1386,7 +1386,7 @@
 				DEVELOPMENT_TEAM = QBMN2BBW3K;
 				ENABLE_BITCODE = NO;
 				INFOPLIST_FILE = HandyJSONDemo/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.aliyun.app.HandyJSONDemo;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -1402,7 +1402,7 @@
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "Tests/HandyJSONTests/Info-iOS.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.aliyun.app.HandyJSONTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -1417,7 +1417,7 @@
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "Tests/HandyJSONTests/Info-iOS.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.aliyun.app.HandyJSONTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
diff --git a/Source/Metadata.swift b/Source/Metadata.swift
index 35d78b3..49fbd32 100755
--- a/Source/Metadata.swift
+++ b/Source/Metadata.swift
@@ -290,11 +290,14 @@ extension Metadata {
                 var name: String?
                 var type: Any.Type?
             }
-            for i in 0..<self.numberOfFields {
+            for i in 0..<self.numberOfFields where fieldRecords[i].mangledTypeName != nil{
                 let name = fieldRecords[i].fieldName
-                if let cMangledTypeName = fieldRecords[i].mangledTypeName,
-                    let fieldType = _getTypeByMangledNameInContext(cMangledTypeName, getMangledTypeNameSize(cMangledTypeName), genericContext: self.contextDescriptorPointer, genericArguments: self.genericArgumentVector) {
-
+                let cMangledTypeName = fieldRecords[i].mangledTypeName!
+                
+                let functionMap: [String: () -> Any.Type?] = [
+                    "function": { _getTypeByMangledNameInContext(cMangledTypeName, getMangledTypeNameSize(cMangledTypeName), genericContext: self.contextDescriptorPointer, genericArguments: self.genericArgumentVector) }
+                ]
+                if let function = functionMap["function"],let fieldType  = function() {
                     result.append(Property.Description(key: name, type: fieldType, offset: fieldOffsets[i]))
                 }
             }