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Source/bindings/core/v8/V8PerIsolateData.cpp

Index: Source/bindings/core/v8/V8PerIsolateData.cpp
diff --git a/Source/bindings/core/v8/V8PerIsolateData.cpp b/Source/bindings/core/v8/V8PerIsolateData.cpp
index a1bd8584735efd5763fef1a1ca04355e10248ab8..d5aa45c6d7d8f79c13d732112242c2243266d8d0 100644
--- a/Source/bindings/core/v8/V8PerIsolateData.cpp
+++ b/Source/bindings/core/v8/V8PerIsolateData.cpp
@@ -62,7 +62,8 @@ static void useCounterCallback(v8::Isolate* isolate, v8::Isolate::UseCounterFeat
 }
 
 V8PerIsolateData::V8PerIsolateData()
-    : m_isolateHolder(adoptPtr(new gin::IsolateHolder()))
+    : m_destructionPending(false)
+    , m_isolateHolder(adoptPtr(new gin::IsolateHolder()))
     , m_stringCache(adoptPtr(new StringCache(isolate())))
     , m_hiddenValue(adoptPtr(new V8HiddenValue()))
     , m_constructorMode(ConstructorMode::CreateNewObject)
@@ -122,6 +123,9 @@ void V8PerIsolateData::willBeDestroyed(v8::Isolate* isolate)
 {
     V8PerIsolateData* data = from(isolate);
 
+    ASSERT(!data->m_destructionPending);
+    data->m_destructionPending = true;
+
     // Clear any data that may have handles into the heap,
     // prior to calling ThreadState::detach().
     data->m_idbPendingTransactionMonitor.clear();