Mermaid error

A subgraph without end swallows the rest of the diagram

Reproduced on Mermaid 11.17.2 · Updated 11 September 2026

A subgraph without end swallows the rest of the diagram in Mermaid. The exact parser message, why it happens, and corrected source that renders.

What Mermaid says

Parse error on line 5:
...  A --> B  C --> D
---------------------^
Expecting 'SEMI', 'NEWLINE', 'SPACE', 'EOF', 'subgraph', 'end', 'acc_title', 'acc_descr', 'acc_descr_multiline_value', 'AMP', 'COLON', 'STYLE', 'LINKSTYLE', 'CLASSDEF', 'CLASS', 'CLICK', 'DOWN', 'DEFAULT', 'NUM', 'COMMA', 'NODE_STRING', 'BRKT', 'MINUS', 'MULT', 'UNICODE_TEXT', 'direction_tb', 'direction_bt', 'direction_rl', 'direction_lr', 'direction_td', got '1'

Why it happens

A subgraph block stays open until an end line closes it. Without that line the later statements are read inside the group and the diagram fails at the last line.

The source that fails

flowchart TD
  subgraph Team
    A --> B
  C --> D

How to fix it

Close each subgraph with its own end line.

flowchart TD
  subgraph Team
    A --> B
  end
  C --> D

The corrected source, rendered with Mermaid 11.17.2.

Next steps

Paste your own version into the Mermaid repair tool, which applies this correction and fourteen others and shows every change. The related page covers the surrounding syntax, and the error dictionary lists every message.