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-rw-r--r--Source/JavaScriptCore/runtime/JSString.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/JSString.cpp b/Source/JavaScriptCore/runtime/JSString.cpp
index 86704d715..6f0b09d13 100644
--- a/Source/JavaScriptCore/runtime/JSString.cpp
+++ b/Source/JavaScriptCore/runtime/JSString.cpp
@@ -40,6 +40,7 @@ void JSRopeString::RopeBuilder::expand()
{
ASSERT(m_index == JSRopeString::s_maxInternalRopeLength);
JSString* jsString = m_jsString;
+ RELEASE_ASSERT(jsString);
m_jsString = jsStringBuilder(&m_vm);
m_index = 0;
append(jsString);