面对iOS设备下的WKWebView与支付宝交互过程中的崩溃问题，如何寻找解决方案？

H5页面跳转支付宝出现崩溃问题，如下

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Completion handler passed to -[WKWebViewJavascriptBridge webView:decidePolicyForNavigationAction:decisionHandler:] was not called'
terminating with uncaught exception of type NSException

代码如下：

在代理方法

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler

if([navigationAction.request.URL.absoluteString hasPrefix:@"alipays://"]||[navigationAction.request.URL.absoluteString hasPrefix:@"alipay://"]){
NSString* reqUrl = navigationAction.request.URL.absoluteString;
if ([reqUrl hasPrefix:@"alipays://"] || [reqUrl hasPrefix:@"alipay://"]) {
&nb