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When I set JSON data into userInfo, dispatchMessageToScriptWithName:userInfo method doesn't send message to JavaScript.Safari app extension source code is the following:(It just sends back data to JavaScript as soon as it receives a message from JavaScript.)- (void)messageReceivedWithName:(NSString *)messageName fromPage:(SFSafariPage *)page userInfo:(NSDictionary *)userInfo { // send to JavaScript NSError *error; NSData *jsonData ; NSError *localError; NSDictionary *resDic = @{ @"logType": @"0", @"observerMode": @"0", @"key": @"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" }; @try { jsonData = [NSJSONSerialization dataWithJSONObject:resDic options:0 error:&localError]; } @catch (NSException *exception) { NSDictionary *userInfo = @{ @"reason": exception.reason}; localError = [NSError errorWithDomain:@"jp.co.***.SafariAppExtNoDispatch" code:1001 userInfo:userInfo]; } @finally { if (localError) { NSLog(@"Data convert error, %@, data=%@", localError, resDic); error = localError; return; } } NSDictionary *dic = @{@"res": jsonData }; NSLog(@"[%@ %@] dic%@", NSStringFromClass([self class]), NSStringFromSelector(_cmd), dic); [page dispatchMessageToScriptWithName:@"message" userInfo:dic]; }JavaScript is the following:(It sends a message to the app extension when you visit a site and outputs a log message when JavaScript received a message from the app extension.)'use strict'; if (window.top === window) { const html = document.getElementsByTagName("HTML"); console.log("stat to send message by using safari.extension.dispatchMessage:[" + location.href + "]"); document.addEventListener("DOMContentLoaded", function(event) { safari.extension.dispatchMessage("message", {BodyRaw: html[0].innerHTML}); }); safari.self.addEventListener('message', hanedleReceivedMessage, false); function hanedleReceivedMessage(evt) { console.log("Message received from Extension handler"); } }The received message(console log) doesn't appear when I visit any sites.If I switch JSON data to NSDictionary, it works fine in this simple code. But in the real app, it doesn't work either occasionally.Does anyone have a workaround or any good idea?Thanks in advance.