An error is reported when using the eval function to manipulate JSON

[LALA]

I used the eval function in fiddlerscript to dynamically load code from the server when fiddler was opened.But when using the eval function to process JSON, the program throws an exception.code show as below：

 //Operating normally
if(oSession.uriContains('https://xxxxxx.com')){
                var responseStringOriginal =  oSession.GetResponseBodyAsString();
                var responseJSON = Fiddler.WebFormats.JSON.JsonDecode(responseStringOriginal);
                responseJSON.JSONObject['data']['data1']['data2'] = 22;
                responseJSON.JSONObject['data']['data1']['data3'] = 1;
                responseJSON.JSONObject['data']['data1']['data4'][0]['type'] = 2;
                responseJSON.JSONObject['data']['data1']['data5'][0]['type'] = 22;
                var responseStringDestinal = Fiddler.WebFormats.JSON.JsonEncode(responseJSON.JSONObject);
                oSession.utilSetResponseBody(responseStringDestinal);
            }

//throw an exception

eval("if(oSession.uriContains('https://xxxxxx.com')){var responseStringOriginal=oSession.GetResponseBodyAsString();var responseJSON=Fiddler.WebFormats.JSON.JsonDecode(responseStringOriginal);responseJSON.JSONObject['data']['data1']['data2']=22;responseJSON.JSONObject['data']['data1']['data3']=1;responseJSON.JSONObject['data']['data1']['data4'][0]['type']=2;responseJSON.JSONObject['data']['data1']['data5'][0]['type']=22;var responseStringDestinal=Fiddler.WebFormats.JSON.JsonEncode(responseJSON.JSONObject);oSession.utilSetResponseBody(responseStringDestinal)}")

Under my constant testing, I found that when the program is executed to JSON containing [number], it will throw an exception. It runs normally when the statement was deleted

 

（It says that Hashtable cannot cast to StackFrame）

Thanks for help.