diff --git a/cocos/base/CCData.cpp b/cocos/base/CCData.cpp
index 40e10777dc..5b2a1189a9 100644
--- a/cocos/base/CCData.cpp
+++ b/cocos/base/CCData.cpp
@@ -62,15 +62,21 @@ Data::~Data()
 
 Data& Data::operator= (const Data& other)
 {
-    CCLOGINFO("In the copy assignment of Data.");
-    copy(other._bytes, other._size);
+    if (this != &other)
+    {
+        CCLOGINFO("In the copy assignment of Data.");
+        copy(other._bytes, other._size);
+    }
     return *this;
 }
 
 Data& Data::operator= (Data&& other)
 {
-    CCLOGINFO("In the move assignment of Data.");
-    move(other);
+    if (this != &other)
+    {
+        CCLOGINFO("In the move assignment of Data.");
+        move(other);
+    }
     return *this;
 }
 
diff --git a/cocos/renderer/CCGLProgramState.cpp b/cocos/renderer/CCGLProgramState.cpp
index 571665d99f..13ab9e6c0e 100644
--- a/cocos/renderer/CCGLProgramState.cpp
+++ b/cocos/renderer/CCGLProgramState.cpp
@@ -273,14 +273,17 @@ void UniformValue::setMat4(const Mat4& value)
 
 UniformValue& UniformValue::operator=(const UniformValue& o)
 {
-    _uniform = o._uniform;
-    _glprogram = o._glprogram;
-    _type = o._type;
-    _value = o._value;
-    
-    if (_uniform->type == GL_SAMPLER_2D)
+    if (this != &o)
     {
-        CC_SAFE_RETAIN(_value.tex.texture);
+        _uniform = o._uniform;
+        _glprogram = o._glprogram;
+        _type = o._type;
+        _value = o._value;
+
+        if (_uniform->type == GL_SAMPLER_2D)
+        {
+            CC_SAFE_RETAIN(_value.tex.texture);
+        }
     }
     return *this;
 }