diff --git a/src/core/content_browser_client_qt.cpp b/src/core/content_browser_client_qt.cpp
index b30c4dfa773fea287023508635ba47b601466281..de6e29de62009d11d18de492e325a9e3e82db133 100644
--- a/src/core/content_browser_client_qt.cpp
+++ b/src/core/content_browser_client_qt.cpp
@@ -447,8 +447,11 @@ content::MediaObserver *ContentBrowserClientQt::GetMediaObserver()
 
 void ContentBrowserClientQt::OverrideWebkitPrefs(content::RenderViewHost *rvh, content::WebPreferences *web_prefs)
 {
-    if (content::WebContents *webContents = rvh->GetDelegate()->GetAsWebContents())
-        static_cast<WebContentsDelegateQt*>(webContents->GetDelegate())->overrideWebPreferences(webContents, web_prefs);
+    if (content::WebContents *webContents = rvh->GetDelegate()->GetAsWebContents()) {
+        WebContentsDelegateQt* delegate = static_cast<WebContentsDelegateQt*>(webContents->GetDelegate());
+        if (delegate)
+            delegate->overrideWebPreferences(webContents, web_prefs);
+    }
 }
 
 content::QuotaPermissionContext *ContentBrowserClientQt::CreateQuotaPermissionContext()
diff --git a/src/core/web_contents_view_qt.cpp b/src/core/web_contents_view_qt.cpp
index 4f921bd072912a4eaafcfe5d15ab7e158deab423..844544887c1980c6cc044ae3d96a88276468b25a 100644
--- a/src/core/web_contents_view_qt.cpp
+++ b/src/core/web_contents_view_qt.cpp
@@ -118,8 +118,10 @@ gfx::NativeView WebContentsViewQt::GetNativeView() const
 
 void WebContentsViewQt::GetContainerBounds(gfx::Rect* out) const
 {
-    const QRectF r(m_client->viewportRect());
-    *out = gfx::Rect(r.x(), r.y(), r.width(), r.height());
+    if (m_client) {
+        const QRectF r(m_client->viewportRect());
+        *out = gfx::Rect(r.x(), r.y(), r.width(), r.height());
+    }
 }
 
 void WebContentsViewQt::Focus()