laravel/framework · error · InvalidArgumentException

Index name contains invalid characters.

Error message

Index name contains invalid characters.

What it means

SQLiteGrammar's compileIndexHint only processes 'force' type hints (SQLite's INDEXED BY clause). It validates the index name against /^[a-zA-Z0-9_$]+$/ and throws if the name contains characters outside that set. Unlike MySQL, SQLite handles a single index (not comma-separated). 'hint' and 'ignore' types are silently ignored (return empty string).

Solutions

1. Rename the index in the migration to use only alphanumeric, underscore, and dollar-sign characters
2. Remove invalid characters from the index name string
3. If testing on SQLite, the index hint is only enforced for force type — ensure the index name matches SQLite naming rules

Example fix

// before — invalid characters in index name throws on SQLite
DB::table('users')->forceIndex('users.email-lookup')->get();

// after — valid index name passes
DB::table('users')->forceIndex('users_email_lookup')->get();

$indexName = 'users_email_lookup';
if (preg_match('/^[a-zA-Z0-9_$]+$/', $indexName)) {
    DB::table('users')->forceIndex($indexName)->get();
} else {
    $sanitized = preg_replace('/[^a-zA-Z0-9_$]/', '_', $indexName);
    DB::table('users')->forceIndex($sanitized)->get();
}

function isValidIndexName(string $name): bool {
    return (bool) preg_match('/^[a-zA-Z0-9_$]+$/', $name);
}

try {
    DB::table('users')->forceIndex($indexName)->get();
} catch (\InvalidArgumentException $e) {
    if (str_contains($e->getMessage(), 'invalid characters')) {
        $sanitized = preg_replace('/[^a-zA-Z0-9_$]/', '_', $indexName);
        DB::table('users')->forceIndex($sanitized)->get();
    } else {
        throw $e;
    }
}

When it happens

Trigger: Calling ->forceIndex('bad name') or ->from('table', indexHint with type 'force' and invalid name) on a SQLite connection. Index names with spaces, hyphens, dots, or other special characters trigger the throw.

Common situations: Using forceIndex in code that runs on multiple database engines — the index name is valid on one engine but contains characters SQLite rejects. Running tests on SQLite with index hints designed for MySQL.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

Related errors

• Index name contains invalid characters.
• Index name contains invalid characters.
• This database engine does not support lateral joins.
• Add fillable property
• Collection given to whereAttachedTo method may not be empty.

AI-assisted analysis of laravel/framework@e0f6eb3518 (2026-08-11). Data as JSON: /api/errors/0773d9d928ddd9e6. Report an issue: GitHub.

Appendix: source

Thrown at src/Illuminate/Database/Query/Grammars/SQLiteGrammar.php:185

    /**
     * Compile the index hints for the query.
     *
     * @param  \Illuminate\Database\Query\Builder  $query
     * @param  \Illuminate\Database\Query\IndexHint  $indexHint
     * @return string
     *
     * @throws \InvalidArgumentException
     */
    protected function compileIndexHint(Builder $query, $indexHint)
    {
        if ($indexHint->type !== 'force') {
            return '';
        }

        $index = $indexHint->index;

        if (! preg_match('/^[a-zA-Z0-9_$]+$/', $index)) {
            throw new InvalidArgumentException('Index name contains invalid characters.');
        }

        return "indexed by {$index}";
    }

    /**
     * Compile a "JSON length" statement into SQL.
     *
     * @param  string  $column
     * @param  string  $operator
     * @param  string  $value
     * @return string
     */
    protected function compileJsonLength($column, $operator, $value)
    {
        [$field, $path] = $this->wrapJsonFieldAndPath($column);

        return 'json_array_length('.$field.$path.') '.$operator.' '.$value;

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