wkwebView加载mainBundle资源相关本地html 涉及html，css ，js等资源时奔溃

This problem is based on iOS11 beta，the details are:

the request:

NSString *htmlPath = [[NSBundle mainBundle] pathForResource:@"xxx" ofType:@"html"];
NSMutableURLRequest * request = [[NSMutableURLRequest alloc]initWithURL:[NSURL URLWithString:htmlPath]];
[self.webView loadRequest:request];

pragma mark - WKNavigationDelegate:

-(void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{
decisionHandler(WKNavigationActionPolicyAllow);//奔溃地方 (crash)
}

-(void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{
decisionHandler(WKNavigationResponsePolicyAllow);
}

情况说明：前面使用了loadRequest的请求方式，奔溃的地方在后面的代理decidePolicyForNavigationAction：使用WKNavigationActionPolicyAllow奔溃；在iOS11 beta以下正常.

经调试：采用loadHtmlWithString时不调用baseurl不会奔溃，但是肯定没有使用和加载数据

奔溃信息：Thread 1: signal SIGABRT

invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopError_RunCalledWithInvalidMode to debug. This message will only appear once per execution.

libc++abi.dylib: terminate_handler unexpectedly threw an exception

Ask for your advice, thank you!!