--- js/src/jsopcode.cpp.orig	2013-02-11 14:33:23.000000000 -0800
+++ js/src/jsopcode.cpp	2017-03-26 10:02:26.000000000 -0700
@@ -6067,7 +6067,7 @@ ExpressionDecompiler::write(JSString *s)
 bool
 ExpressionDecompiler::quote(JSString *s, uint32_t quote)
 {
-    return QuoteString(&sprinter, s, quote) >= 0;
+    return QuoteString(&sprinter, s, quote) != NULL;
 }
 
 JSAtom *