diff --git a/SensorsAnalyticsSDK.podspec b/SensorsAnalyticsSDK.podspec
index 6f5d4696..130e5dcf 100644
--- a/SensorsAnalyticsSDK.podspec
+++ b/SensorsAnalyticsSDK.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "SensorsAnalyticsSDK"
-  s.version      = "4.7.1"
+  s.version      = "4.7.2"
   s.summary      = "The official iOS SDK of Sensors Analytics."
   s.homepage     = "http://www.sensorsdata.cn"
   s.source       = { :git => 'https://github.com/sensorsdata/sa-sdk-ios.git', :tag => "v#{s.version}" }
diff --git a/SensorsAnalyticsSDK/Core/HookDelegate/NSObject+SADelegateProxy.m b/SensorsAnalyticsSDK/Core/HookDelegate/NSObject+SADelegateProxy.m
index 784b2eb3..1663c5cb 100644
--- a/SensorsAnalyticsSDK/Core/HookDelegate/NSObject+SADelegateProxy.m
+++ b/SensorsAnalyticsSDK/Core/HookDelegate/NSObject+SADelegateProxy.m
@@ -59,7 +59,7 @@ - (BOOL)sensorsdata_respondsToSelector:(SEL)aSelector {
     }
 
 #if TARGET_OS_IOS
-    if ([[UIDevice currentDevice].systemVersion floatValue] == 18.0) {
+    if (@available(iOS 18.0, *)) {
         char cString = (char)sel_getName(aSelector);
         if (cString == '\x01') {
             return NO;
diff --git a/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK.m b/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK.m
index 6c123117..8387a6db 100755
--- a/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK.m
+++ b/SensorsAnalyticsSDK/Core/SensorsAnalyticsSDK.m
@@ -68,7 +68,7 @@
 #import <UIKit/UIApplication.h>
 #endif
 
-#define VERSION @"4.7.1"
+#define VERSION @"4.7.2"
 
 void *SensorsAnalyticsQueueTag = &SensorsAnalyticsQueueTag;
 
diff --git a/SensorsAnalyticsSDK/Store/SAAESCrypt.m b/SensorsAnalyticsSDK/Store/SAAESCrypt.m
index 987a791c..d3d1768c 100644
--- a/SensorsAnalyticsSDK/Store/SAAESCrypt.m
+++ b/SensorsAnalyticsSDK/Store/SAAESCrypt.m
@@ -63,6 +63,7 @@ - (nullable NSString *)encryptData:(NSData *)obj {
     NSMutableData *iv = [NSMutableData dataWithLength:kCCBlockSizeAES128];
     int result = SecRandomCopyBytes(kSecRandomDefault, kCCBlockSizeAES128, iv.mutableBytes);
     if (result != errSecSuccess) {
+        free(buffer);
         return nil;
     }
 
@@ -111,6 +112,7 @@ - (nullable NSData *)decryptData:(NSData *)obj {
     NSMutableData *iv = [NSMutableData dataWithLength:kCCBlockSizeAES128];
     int result = SecRandomCopyBytes(kSecRandomDefault, kCCBlockSizeAES128, iv.mutableBytes);
     if (result != errSecSuccess) {
+        free(buffer);
         return nil;
     }
 
diff --git a/SensorsAnalyticsTests/SAEncryptTests.m b/SensorsAnalyticsTests/SAEncryptTests.m
index 91bf7740..3f22e890 100644
--- a/SensorsAnalyticsTests/SAEncryptTests.m
+++ b/SensorsAnalyticsTests/SAEncryptTests.m
@@ -90,6 +90,7 @@ - (NSString *)aesDecrypt:(NSData *)publicKey encryptedContent:(NSString *)encryp
         NSData *result = [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
         NSRange range = NSMakeRange(16, result.length - 16);
         NSData *da = [result subdataWithRange:range];
+
         return [[NSString alloc] initWithData:da encoding:NSUTF8StringEncoding];
     }
     free(buffer);