laravel/framework · error · InvalidArgumentException

Number of groups must be at least 1.

Error message

Number of groups must be at least 1.

What it means

Thrown by LazyCollection::split($numberOfGroups) when the argument is < 1. split divides a lazy collection into a number of groups via passthru to the underlying eager Collection::split, and rejects an invalid group count up front with an InvalidArgumentException. This is the lazy analogue of the Collection method.

Solutions

1. Ensure $numberOfGroups >= 1: ->split(max(1, $value)).
2. Validate the input at the controller/request layer.
3. Use a sensible default when the source value is absent.

Example fix

// before
$parts = $lazy->split($request->input('buckets'));
// after
$buckets = max(1, (int) $request->input('buckets', 1));
$parts = $lazy->split($buckets);

if ($numberOfGroups < 1) {
    throw new \InvalidArgumentException('numberOfGroups must be >= 1');
}
return $lazy->split($numberOfGroups);

$numberOfGroups = (is_int($numberOfGroups) && $numberOfGroups >= 1) ? $numberOfGroups : 1;

try {
    return $lazy->split($value);
} catch (\InvalidArgumentException $e) {
    return $lazy->split(1);
}

When it happens

Trigger: ->split(0), ->split(-3); group count derived from user input or a divisor that yields <= 0.

Common situations: Splitting results into N columns for display with N computed from a request; configurable bucket count defaulting to 0; dynamic value that becomes 0 on edge cases.

Related errors

• Size value must be at least 1.
• Step value cannot be zero.
• Step value must be at least 1.
• Generators should not be passed directly to LazyCollection…
• Collection should only include

AI-assisted analysis of laravel/framework@e0f6eb3518 (2026-08-11). Data as JSON: /api/errors/58155f4e398f4f6b. Report an issue: GitHub.

Appendix: source

Thrown at src/Illuminate/Collections/LazyCollection.php:1318

        if ($offset < 0 || $length < 0) {
            return $this->passthru(__FUNCTION__, func_get_args());
        }

        $instance = $this->skip($offset);

        return is_null($length) ? $instance : $instance->take($length);
    }

    /**
     * {@inheritDoc}
     *
     * @throws \InvalidArgumentException
     */
    #[\Override]
    public function split($numberOfGroups)
    {
        if ($numberOfGroups < 1) {
            throw new InvalidArgumentException('Number of groups must be at least 1.');
        }

        return $this->passthru(__FUNCTION__, func_get_args());
    }

    /**
     * Get the first item in the collection, but only if exactly one item exists. Otherwise, throw an exception.
     *
     * @param  (callable(TValue, TKey): bool)|string|null  $key
     * @param  mixed  $operator
     * @param  mixed  $value
     * @return TValue
     *
     * @throws \Illuminate\Support\ItemNotFoundException
     * @throws \Illuminate\Support\MultipleItemsFoundException
     */
    public function sole($key = null, $operator = null, $value = null)
    {

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