1 files changed, 2 insertions, 0 deletions
diff --git a/WebCore/platform/TreeShared.h b/WebCore/platform/TreeShared.h
index a60ad0d..b844e5f 100644
--- a/WebCore/platform/TreeShared.h
+++ b/WebCore/platform/TreeShared.h
@@ -44,6 +44,7 @@ public:
     virtual ~TreeShared()
     {
         ASSERT(isMainThread());
+        ASSERT(!m_refCount);
         ASSERT(m_deletionHasBegun);
     }
 
@@ -58,6 +59,7 @@ public:
     void deref()
     {
         ASSERT(isMainThread());
+        ASSERT(m_refCount >= 0);
         ASSERT(!m_deletionHasBegun);
         ASSERT(!m_inRemovedLastRefFunction);
         if (--m_refCount <= 0 && !m_parent) {