PromptTemplate, second iteration not working

[sorrentinopasquale]

Hi, I am trying to make a bot with history and a custom prompt:
`const noInputPrompt = new PromptTemplate(
{
inputVariables: [],
template: "You are an assistant of a doctor and help customer on that." +
"You do a flow, collect name, last name and email. Then finish the call. Do that one by one. So you say hello and then ask first question.",
}
);

const chain = new ConversationChain({ llm: chatModel, memory: memory, prompt: noInputPrompt});

const stream = await chain.call({
input: input,
callbacks...`

The issue is that when I call it the first time it works. When I do again it stops working. If I remove the template it works.
Basically after the chain finishes without returning anything, I also tried with ConversationChain.