nikic/PHP-Parser · error · LogicException

%s type cannot be nullable

Error message

%s type cannot be nullable

What it means

Error "%s type cannot be nullable" thrown in nikic/PHP-Parser.

Source

Thrown at lib/PhpParser/BuilderHelpers.php:208

            'null',
            'false',
            'mixed',
            'never',
            'true',
        ];

        $lowerType = strtolower($type);
        if (in_array($lowerType, $builtinTypes)) {
            $type = new Identifier($lowerType);
        } else {
            $type = self::normalizeName($type);
        }

        $notNullableTypes = [
            'void', 'mixed', 'never',
        ];
        if ($nullable && in_array((string) $type, $notNullableTypes)) {
            throw new \LogicException(sprintf('%s type cannot be nullable', $type));
        }

        return $nullable ? new NullableType($type) : $type;
    }

    /**
     * Normalizes a value: Converts nulls, booleans, integers,
     * floats, strings and arrays into their respective nodes
     *
     * @param Node\Expr|bool|null|int|float|string|array|\UnitEnum $value The value to normalize
     *
     * @return Expr The normalized value
     */
    public static function normalizeValue($value): Expr {
        if ($value instanceof Node\Expr) {
            return $value;
        }

View on GitHub (pinned to fbd47f7ebc)

When it happens

Trigger: Thrown at lib/PhpParser/BuilderHelpers.php:208 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nikic/PHP-Parser@fbd47f7ebc (2026-08-17). Data as JSON: /api/errors/403d2a0349e00f70. Report an issue: GitHub.