diff --git a/src/OpenGl/OpenGl_ShaderObject.cxx b/src/OpenGl/OpenGl_ShaderObject.cxx
index 9537ccd070..e84c11a4ad 100644
--- a/src/OpenGl/OpenGl_ShaderObject.cxx
+++ b/src/OpenGl/OpenGl_ShaderObject.cxx
@@ -139,7 +139,8 @@ void OpenGl_ShaderObject::Release (const OpenGl_Context* theCtx)
   Standard_ASSERT_RETURN (theCtx != NULL,
     "OpenGl_ShaderObject destroyed without GL context! Possible GPU memory leakage...",);
 
-  if (theCtx->core20 != NULL)
+  if (theCtx->core20 != NULL
+   && theCtx->IsValid())
   {
     theCtx->core20->glDeleteShader (myShaderID);
   }
diff --git a/src/OpenGl/OpenGl_ShaderProgram.cxx b/src/OpenGl/OpenGl_ShaderProgram.cxx
index 7a7ffcd646..6a6e5e1f66 100644
--- a/src/OpenGl/OpenGl_ShaderProgram.cxx
+++ b/src/OpenGl/OpenGl_ShaderProgram.cxx
@@ -1120,7 +1120,8 @@ void OpenGl_ShaderProgram::Release (const OpenGl_Context* theCtx)
     anIter.ChangeValue().Nullify();
   }
 
-  if (theCtx->core20 != NULL)
+  if (theCtx->core20 != NULL
+   && theCtx->IsValid())
   {
     theCtx->core20->glDeleteProgram (myProgramID);
   }
diff --git a/src/OpenGl/OpenGl_Texture.cxx b/src/OpenGl/OpenGl_Texture.cxx
index f1c1b9003b..2e9552c8d6 100644
--- a/src/OpenGl/OpenGl_Texture.cxx
+++ b/src/OpenGl/OpenGl_Texture.cxx
@@ -111,7 +111,10 @@ void OpenGl_Texture::Release (const OpenGl_Context* theGlCtx)
   Standard_ASSERT_RETURN (theGlCtx != NULL,
     "OpenGl_Texture destroyed without GL context! Possible GPU memory leakage...",);
 
-  glDeleteTextures (1, &myTextureId);
+  if (theGlCtx->IsValid())
+  {
+    glDeleteTextures (1, &myTextureId);
+  }
   myTextureId = NO_TEXTURE;
   mySizeX = mySizeY = 0;
 }