Callin.io Merge node always sends one blank Human Input to the Chat model via AI agent

Describe the problem/error/question

I'm encountering an issue where my AI agent, which uses the Gemini chat model, is failing. The setup involves a Telegram trigger and a memory table. Data from both is merged and then passed to the AI agent. The agent consistently sends two inputs to the model: Human: What do you know about me? and Human: <span class="chcklst-box fa fa-square-o fa-fw"></span>. This, along with the system prompt and a null value, causes the Google Gemini model to break. I'm unable to remove this null input. Even in the simplest scenario, with fixed user input and system prompt, the blank input is still passed, and this problem only occurs when using the merge node.

What is the error message (if any)?

The error message from Gemini is:

[GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:streamGenerateContent?alt=sse: [400 Bad Request] * GenerateContentRequest.contents[1].parts: contents.parts must not be empty.

Please share your workflow

Input ai agent is getting

json
[
{
“update_id”: 123,
“message”: {
“message_id”: 205,
“from”: {
“id”: 235,
“is_bot”: false,
“first_name”: “abc”,
“last_name”: “abc”,
“username”: “r_c”,
“language_code”: “en”
},
“chat”: {
“id”: 112,
“first_name”: “abc”,
“last_name”: “abc”,
“username”: “r_c”,
“type”: “private”
},
“date”: 1739112541,
“text”: “What do you know about me?”
},
“Memory”: [
“abc grew up in usa”,
“Name of the user is abc, he prefers to be called a.”
]
}
]


Information on your callin.io setup

• callin.io version: 1.76.3
• Database (default: SQLite):
• callin.io EXECUTIONS_PROCESS setting (default: own, main):
• Running callin.io via (Docker, npm, callin.io cloud, desktop app): docker, railways
• Operating system: N/a