laravel/framework · warning · LogicException

%s may not be mutated using array access.

Error message

%s may not be mutated using array access.

What it means

ModelInfo is intentionally immutable: it is a snapshot of introspection data, so offsetSet() unconditionally throws LogicException to prevent mutation. There is no path that allows writing via array syntax.

Source

Thrown at src/Illuminate/Database/Eloquent/ModelInfo.php:105

    /**
     * Get the value for a given offset.
     *
     * @throws \InvalidArgumentException
     */
    public function offsetGet(mixed $offset): mixed
    {
        return property_exists($this, $offset) ? $this->{$offset} : throw new InvalidArgumentException("Property {$offset} does not exist.");
    }

    /**
     * Set the value at the given offset.
     *
     * @throws \LogicException
     */
    public function offsetSet(mixed $offset, mixed $value): void
    {
        throw new LogicException(self::class.' may not be mutated using array access.');
    }

    /**
     * Unset the value at the given offset.
     *
     * @throws \LogicException
     */
    public function offsetUnset(mixed $offset): void
    {
        throw new LogicException(self::class.' may not be mutated using array access.');
    }
}

View on GitHub (pinned to bd6b5437e6)

Solutions

1. Do not mutate ModelInfo; build a new value or modify the underlying model/schema instead.
2. If you need a mutable copy, work with $info->toArray() and change the resulting array.
3. Refactor generic ArrayAccess consumers to skip write operations for read-only objects.

Example fix

// before
$info['table'] = 'users'; // throws

// after
$data = $info->toArray();
$data['table'] = 'users';

// ModelInfo is immutable; copy to array before mutating
$data = $info->toArray();
$data[$key] = $value;

function isMutable(ArrayAccess $obj): bool {
    return ! ($obj instanceof \Illuminate\Database\Eloquent\ModelInfo);
}

When it happens

Trigger: Attempting $info['table'] = 'new_table' or any $info[...] = value assignment on a ModelInfo instance.

Common situations: Treating ModelInfo like a regular model or array; code written generically against ArrayAccess that tries to write.

Related errors

• Property {$offset} does not exist.
• The chunkById operation was aborted because the [{$alias}] c
• The lazyById operation was aborted because the [{$alias}] co
• No record found for the given query.
• $count records were found.

AI-assisted analysis of laravel/framework@bd6b5437e6 (2026-08-06). Data as JSON: /data/errors/d5019afdb88712de.json. Report an issue: GitHub.