1 files changed, 9 insertions, 4 deletions
diff --git a/WebCore/html/canvas/WebGLProgram.cpp b/WebCore/html/canvas/WebGLProgram.cpp
index 8cf3c42..0853b67 100644
--- a/WebCore/html/canvas/WebGLProgram.cpp
+++ b/WebCore/html/canvas/WebGLProgram.cpp
@@ -47,12 +47,17 @@ WebGLProgram::WebGLProgram(WebGLRenderingContext* ctx)
 
 void WebGLProgram::deleteObjectImpl(Platform3DObject obj)
 {
-    context()->graphicsContext3D()->deleteProgram(obj);
-    if (!object()) {
-        if (m_vertexShader)
+    if (!isDeleted())
+        context()->graphicsContext3D()->deleteProgram(obj);
+    if (!getAttachmentCount()) {
+        if (m_vertexShader) {
             m_vertexShader->onDetached();
-        if (m_fragmentShader)
+            m_vertexShader = 0;
+        }
+        if (m_fragmentShader) {
             m_fragmentShader->onDetached();
+            m_fragmentShader = 0;
+        }
     }
 }