nikic/PHP-Parser · error · \LogicException

leaveNode() may only return an array if the parent structure

Error message

leaveNode() may only return an array if the parent structure is an array

What it means

Error "leaveNode() may only return an array if the parent structure is an array" thrown in nikic/PHP-Parser.

Source

Thrown at lib/PhpParser/NodeTraverser.php:160

                }
            }

            for (; $visitorIndex >= 0; --$visitorIndex) {
                $visitor = $this->visitors[$visitorIndex];
                $return = $visitor->leaveNode($subNode);

                if (null !== $return) {
                    if ($return instanceof Node) {
                        $this->ensureReplacementReasonable($subNode, $return);
                        $subNode = $node->$name = $return;
                    } elseif (NodeVisitor::STOP_TRAVERSAL === $return) {
                        $this->stopTraversal = true;
                        break 2;
                    } elseif (NodeVisitor::REPLACE_WITH_NULL === $return) {
                        $node->$name = null;
                        break;
                    } elseif (\is_array($return)) {
                        throw new \LogicException(
                            'leaveNode() may only return an array ' .
                            'if the parent structure is an array'
                        );
                    } else {
                        throw new \LogicException(
                            'leaveNode() returned invalid value of type ' . gettype($return)
                        );
                    }
                }
            }
        }
    }

    /**
     * Recursively traverse array (usually of nodes).
     *
     * @param Node[] $nodes Array to traverse
     *

View on GitHub (pinned to fbd47f7ebc)

When it happens

Trigger: Thrown at lib/PhpParser/NodeTraverser.php:160 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/8f002a82f7e8dd23. Report an issue: GitHub.