--- a/js/jsd/jsd_val.c
+++ b/js/jsd/jsd_val.c
@@ -235,16 +235,17 @@ jsd_GetValueString(JSDContext* jsdc, JSD
         return NULL;
     }
     exceptionState = JS_SaveExceptionState(cx);
 
     string = JS_ValueToString(cx, jsdval->val);
 
     JS_RestoreExceptionState(cx, exceptionState);
     JS_LeaveCrossCompartmentCall(call);
+    call = NULL;
 
     if(string) {
         stringval = STRING_TO_JSVAL(string);
         call = JS_EnterCrossCompartmentCall(cx, jsdc->glob);
     }
     if(!string || !call || !JS_WrapValue(cx, &stringval)) {
         if(call)
             JS_LeaveCrossCompartmentCall(call);