diff --git a/js/jsd/jsd_stak.cpp b/js/jsd/jsd_stak.cpp
index 50e10fbe776..ad4089ffe94 100644
--- a/js/jsd/jsd_stak.cpp
+++ b/js/jsd/jsd_stak.cpp
@@ -544,11 +544,10 @@ JSDValue*
 jsd_GetException(JSDContext* jsdc, JSDThreadState* jsdthreadstate)
 {
     JSContext* cx;
-    JS::RootedValue val(cx);
-
     if(!(cx = _getContextForThreadState(jsdc, jsdthreadstate)))
         return nullptr;
 
+    JS::RootedValue val(cx);
     if(JS_GetPendingException(cx, &val))
         return jsd_NewValue(jsdc, val);
     return nullptr;