1 files changed, 6 insertions, 3 deletions
diff --git a/Source/JavaScriptCore/interpreter/Interpreter.cpp b/Source/JavaScriptCore/interpreter/Interpreter.cpp
index 51843f2d2..d42e869f1 100644
--- a/Source/JavaScriptCore/interpreter/Interpreter.cpp
+++ b/Source/JavaScriptCore/interpreter/Interpreter.cpp
@@ -885,6 +885,8 @@ JSValue Interpreter::execute(ProgramExecutable* program, CallFrame* callFrame, S
     Vector<JSONPData> JSONPData;
     bool parseResult;
     const UString programSource = program->source().toString();
+    if (programSource.isNull())
+        return jsUndefined();
     if (programSource.is8Bit()) {
         LiteralParser<LChar> literalParser(callFrame, programSource.characters8(), programSource.length(), JSONP);
         parseResult = literalParser.tryJSONPParse(JSONPData, scopeChain->globalObject->globalObjectMethodTable()->supportsRichSourceInfo(scopeChain->globalObject.get()));
@@ -5126,11 +5128,12 @@ JSValue Interpreter::retrieveCallerFromVMCode(CallFrame* callFrame, JSFunction*
     CallFrame* functionCallFrame = findFunctionCallFrameFromVMCode(callFrame, function);
     if (!functionCallFrame)
         return jsNull();
-
-    CallFrame* callerFrame = functionCallFrame->callerFrame();
-    if (callerFrame->hasHostCallFrameFlag())
+    
+    if (functionCallFrame->callerFrame()->hasHostCallFrameFlag())
         return jsNull();
 
+    CallFrame* callerFrame = functionCallFrame->trueCallerFrame();
+
     JSValue caller = callerFrame->callee();
     if (!caller)
         return jsNull();