1 files changed, 3 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/parser/Parser.h b/Source/JavaScriptCore/parser/Parser.h
index 02a726a56..bce94ba25 100644
--- a/Source/JavaScriptCore/parser/Parser.h
+++ b/Source/JavaScriptCore/parser/Parser.h
@@ -1114,7 +1114,10 @@ private:
 
     void setErrorMessage(const String& message)
     {
+        ASSERT_WITH_MESSAGE(!message.isEmpty(), "Attempted to set the empty string as an error message. Likely caused by invalid UTF8 used when creating the message.");
         m_errorMessage = message;
+        if (m_errorMessage.isEmpty())
+            m_errorMessage = ASCIILiteral("Unparseable script");
     }
     
     NEVER_INLINE void logError(bool);