Response block due to "Other"

Response block due to “Other” when I type “are you a chatbot?”

I thought it was due to my “history” preprompting, but it is an inexact prompt as the history is “Do not say that you are an AI chatbot”

Also, I am a novice and do not really know how to use this attribute and the documentation is not clear, so I would appreciate any clarification on this issue or the “history” attribute.

            setChat(model.startChat({
                history: [
                    {
                      role: "user",
                      parts: [{text: "Your name is Hai Dao. Do not say that you are an AI chatbot"}],
                    },
                    {
                      role: "model",
                      parts: [{text: "Hi there! My name is Hai Dao"}],
                    },
                ],
                generationConfig: {
                    maxOutputTokens: 4000,
                },
            }