(new): v1.2 release

bot_register.go

@@ -150,6 +150,15 @@ func (bot *Bot[T]) AddRunner(runner Runner[T]) *Bot[T] {
 //	    return data.QueryLogger()
 //	})
 func (bot *Bot[T]) AddAppDataLoggerWriter(writer AppDataLogger[T]) *Bot[T] {
+	if !bot.configMutable("AddAppDataLoggerWriter") {
+		return bot
+	}
+	if writer == nil {
+		if bot.logger != nil {
+			bot.logger.Warnln("AddAppDataLoggerWriter called with nil writer; nothing changed")
+		}
+		return bot
+	}
 	if !bot.hasAppData {
 		bot.logger.Warnln("app data is not set; skipping app-data logger writer")
 		return bot
@@ -159,6 +168,12 @@ func (bot *Bot[T]) AddAppDataLoggerWriter(writer AppDataLogger[T]) *Bot[T] {
 		return bot
 	}
 	w := writer(bot.appData)
+	if isNilValue(w) {
+		if bot.logger != nil {
+			bot.logger.Warnln("app-data logger writer returned nil; nothing changed")
+		}
+		return bot
+	}
 	bot.logger.AddWriters(w)
 	if bot.requestLogger != nil {
 		bot.requestLogger.AddWriters(w)