GEMINI: Prism\Prism\ValueObjects\ToolCall::__construct(): Argument #1 ($id) must be of type string, null given

[vpuentem]

When using Prism with Gemini provider (gemini-2.5-flash) with withMessages(), withTools(), and withMaxSteps(), the request fails with a 500 Internal Server Error.

"Prism\Prism\ValueObjects\ToolCall::__construct(): Argument #1 ($id) must be of type string, null given, called in ...\vendor\prism-php\prism\src\Providers\Gemini\Maps\ToolCallMap.php on line 21"

Code Example

$tools=[
     Tool::as('tool_name')
           ->for('Tool definition.')
           ->withBooleanParameter('parameter', 'Parameter definition')
           ->using(fn () => ''),

$messages = [
    new UserMessage('Previous user message'),
    new AssistantMessage('Previous assistant response'),
    new UserMessage('Current user message'),
];

$response = Prism::text()
    ->using(Provider::Gemini, 'gemini-2.5-flash')
    ->withSystemPrompt('System prompt here')
    ->withMessages($messages)
    ->withTools($tools) // Array of Tool objects
    ->withMaxSteps(2)
    ->asText();

It doesn't happens all the time, only between requests that require tool usage. Not sure if its a gemini issue because i'm using '' as tool execution code, this is because i'm executing some tools in the frontend, so i pass the tool usage as a response.

This also happened with other gemini versions

Any help would be appreciated, i can also create a PR if its a provider definition issue.