diff --git a/src/app/container/vcontainer.cpp b/src/app/container/vcontainer.cpp
index c2242a3cc..ee38703e4 100644
--- a/src/app/container/vcontainer.cpp
+++ b/src/app/container/vcontainer.cpp
@@ -55,6 +55,10 @@ VContainer::VContainer()
  */
 VContainer &VContainer::operator =(const VContainer &data)
 {
+    if ( &data == this )
+    {
+        return *this;
+    }
     setData(data);
     return *this;
 }
diff --git a/src/app/container/vincrement.cpp b/src/app/container/vincrement.cpp
index b288b0794..e0ae5355f 100644
--- a/src/app/container/vincrement.cpp
+++ b/src/app/container/vincrement.cpp
@@ -57,6 +57,10 @@ VIncrement::VIncrement(const VIncrement &incr)
 //---------------------------------------------------------------------------------------------------------------------
 VIncrement &VIncrement::operator=(const VIncrement &incr)
 {
+    if ( &incr == this )
+    {
+        return *this;
+    }
     VVariable::operator=(incr);
     this->id = incr.getId();
     return *this;
diff --git a/src/app/container/vmeasurement.cpp b/src/app/container/vmeasurement.cpp
index 35ef9bce3..d55cbaf14 100644
--- a/src/app/container/vmeasurement.cpp
+++ b/src/app/container/vmeasurement.cpp
@@ -74,6 +74,10 @@ VMeasurement::VMeasurement(const VMeasurement &m)
 //---------------------------------------------------------------------------------------------------------------------
 VMeasurement &VMeasurement::operator=(const VMeasurement &m)
 {
+    if ( &m == this )
+    {
+        return *this;
+    }
     VVariable::operator=(m);
     this->gui_text = m.GetGuiText();
     this->_tagName = m.TagName();
diff --git a/src/app/container/vvariable.cpp b/src/app/container/vvariable.cpp
index 3ca2cb0ef..55c31000a 100644
--- a/src/app/container/vvariable.cpp
+++ b/src/app/container/vvariable.cpp
@@ -57,6 +57,10 @@ VVariable::VVariable(const VVariable &var)
 //---------------------------------------------------------------------------------------------------------------------
 VVariable &VVariable::operator=(const VVariable &var)
 {
+    if ( &var == this )
+    {
+        return *this;
+    }
     this->base = var.GetBase();
     this->ksize = var.GetKsize();
     this->kheight = var.GetKheight();
diff --git a/src/app/geometry/vabstractcurve.cpp b/src/app/geometry/vabstractcurve.cpp
index 266b9ba1e..c87c0f6f7 100644
--- a/src/app/geometry/vabstractcurve.cpp
+++ b/src/app/geometry/vabstractcurve.cpp
@@ -43,6 +43,10 @@ VAbstractCurve::VAbstractCurve(const VAbstractCurve &curve)
 //---------------------------------------------------------------------------------------------------------------------
 VAbstractCurve &VAbstractCurve::operator=(const VAbstractCurve &curve)
 {
+    if ( &curve == this )
+    {
+        return *this;
+    }
     VGObject::operator=(curve);
     return *this;
 }
diff --git a/src/app/geometry/varc.cpp b/src/app/geometry/varc.cpp
index 54fbf9906..558493191 100644
--- a/src/app/geometry/varc.cpp
+++ b/src/app/geometry/varc.cpp
@@ -81,6 +81,10 @@ VArc::VArc(const VArc &arc)
  */
 VArc &VArc::operator =(const VArc &arc)
 {
+    if ( &arc == this )
+    {
+        return *this;
+    }
     VAbstractCurve::operator=(arc);
     this->f1 = arc.GetF1();
     this->formulaF1 = arc.GetFormulaF1();
diff --git a/src/app/geometry/vdetail.cpp b/src/app/geometry/vdetail.cpp
index 6af182008..51a000bfe 100644
--- a/src/app/geometry/vdetail.cpp
+++ b/src/app/geometry/vdetail.cpp
@@ -53,6 +53,10 @@ VDetail::VDetail(const VDetail &detail)
 //---------------------------------------------------------------------------------------------------------------------
 VDetail &VDetail::operator =(const VDetail &detail)
 {
+    if ( &detail == this )
+    {
+        return *this;
+    }
     _id = detail.id();
     nodes = detail.getNodes();
     name = detail.getName();
diff --git a/src/app/geometry/vgobject.cpp b/src/app/geometry/vgobject.cpp
index 17bb1b859..7e0501499 100644
--- a/src/app/geometry/vgobject.cpp
+++ b/src/app/geometry/vgobject.cpp
@@ -64,6 +64,10 @@ VGObject::VGObject(const VGObject &obj)
  */
 VGObject &VGObject::operator=(const VGObject &obj)
 {
+    if ( &obj == this )
+    {
+        return *this;
+    }
     this->_id      = obj.id();
     this->type     = obj.getType();
     this->idObject = obj.getIdObject();
diff --git a/src/app/geometry/vnodedetail.cpp b/src/app/geometry/vnodedetail.cpp
index 4db005d90..77de99a08 100644
--- a/src/app/geometry/vnodedetail.cpp
+++ b/src/app/geometry/vnodedetail.cpp
@@ -46,6 +46,10 @@ VNodeDetail::VNodeDetail(const VNodeDetail &node)
 //---------------------------------------------------------------------------------------------------------------------
 VNodeDetail &VNodeDetail::operator =(const VNodeDetail &node)
 {
+    if ( &node == this )
+    {
+        return *this;
+    }
     id = node.getId();
     typeTool = node.getTypeTool();
     typeNode = node.getTypeNode();
diff --git a/src/app/geometry/vpointf.cpp b/src/app/geometry/vpointf.cpp
index 61be19c7e..b8f96e339 100644
--- a/src/app/geometry/vpointf.cpp
+++ b/src/app/geometry/vpointf.cpp
@@ -84,6 +84,10 @@ VPointF::VPointF(const QPointF &point) :VGObject(VPointF()), _mx(0), _my(0), _x(
  */
 VPointF &VPointF::operator =(const VPointF &point)
 {
+    if ( &point == this )
+    {
+        return *this;
+    }
     VGObject::operator=(point);
     _mx = point.mx();
     _my = point.my();
diff --git a/src/app/geometry/vspline.cpp b/src/app/geometry/vspline.cpp
index daa06cda1..523388d7b 100644
--- a/src/app/geometry/vspline.cpp
+++ b/src/app/geometry/vspline.cpp
@@ -688,6 +688,10 @@ QVector<QPointF> VSpline::SplinePoints(const QPointF &p1, const QPointF &p4, qre
 //---------------------------------------------------------------------------------------------------------------------
 VSpline &VSpline::operator =(const VSpline &spline)
 {
+    if ( &spline == this )
+    {
+        return *this;
+    }
     VAbstractCurve::operator=(spline);
     this->p1 = spline.GetP1 ();
     this->p2 = spline.GetP2 ();
diff --git a/src/app/geometry/vsplinepath.cpp b/src/app/geometry/vsplinepath.cpp
index aa8d00ab1..818136193 100644
--- a/src/app/geometry/vsplinepath.cpp
+++ b/src/app/geometry/vsplinepath.cpp
@@ -158,6 +158,10 @@ VSplinePoint VSplinePath::GetSplinePoint(qint32 indexSpline, SplinePointPosition
 //---------------------------------------------------------------------------------------------------------------------
 VSplinePath &VSplinePath::operator =(const VSplinePath &path)
 {
+    if ( &path == this )
+    {
+        return *this;
+    }
     VAbstractCurve::operator=(path);
     this->path = path.GetSplinePath();
     this->kCurve = path.getKCurve();
diff --git a/src/app/geometry/vsplinepoint.cpp b/src/app/geometry/vsplinepoint.cpp
index 87b3d0e68..0ebd18b14 100644
--- a/src/app/geometry/vsplinepoint.cpp
+++ b/src/app/geometry/vsplinepoint.cpp
@@ -69,6 +69,10 @@ VSplinePoint::VSplinePoint(const VSplinePoint &point)
 //---------------------------------------------------------------------------------------------------------------------
 VSplinePoint &VSplinePoint::operator=(const VSplinePoint &point)
 {
+    if ( &point == this )
+    {
+        return *this;
+    }
     this->pSpline = point.P();
     this->angle1 = point.Angle1();
     this->angle2 = point.Angle2();
diff --git a/src/app/tools/vdatatool.cpp b/src/app/tools/vdatatool.cpp
index c88ea6d35..ae860dcf2 100644
--- a/src/app/tools/vdatatool.cpp
+++ b/src/app/tools/vdatatool.cpp
@@ -48,6 +48,10 @@ VDataTool::VDataTool(VContainer *data, QObject *parent)
  */
 VDataTool &VDataTool::operator =(const VDataTool &tool)
 {
+    if ( &tool == this )
+    {
+        return *this;
+    }
     data = tool.getData();
     _referens = tool.referens();
     return *this;
diff --git a/src/app/widgets/vtranslation.cpp b/src/app/widgets/vtranslation.cpp
index d43f9eabe..4ded13459 100644
--- a/src/app/widgets/vtranslation.cpp
+++ b/src/app/widgets/vtranslation.cpp
@@ -53,8 +53,11 @@ VTranslation::VTranslation(const QString &context, const QString &sourceText, co
 
 //---------------------------------------------------------------------------------------------------------------------
 VTranslation &VTranslation::operator=(const VTranslation &tr)
-
 {
+    if ( &tr == this )
+    {
+        return *this;
+    }
     this->mcontext = tr.getMcontext();
     this->msourceText = tr.getMsourceText();
     this->mdisambiguation = tr.getMdisambiguation();
diff --git a/src/libs/qmuparser/qmuparsertoken.h b/src/libs/qmuparser/qmuparsertoken.h
index c609e3f0d..3e5d44a62 100644
--- a/src/libs/qmuparser/qmuparsertoken.h
+++ b/src/libs/qmuparser/qmuparsertoken.h
@@ -98,6 +98,10 @@ public:
      */
     QmuParserToken& operator= ( const QmuParserToken &a_Tok )
     {
+        if ( &a_Tok == this )
+        {
+            return *this;
+        }
         Assign ( a_Tok );
         return *this;
     }