Mermaid error

Two diagram type declarations in one block

Reproduced on Mermaid 11.17.2 · Updated 11 September 2026

Two diagram type declarations in one block in Mermaid. The exact parser message, why it happens, and corrected source that renders.

What Mermaid says

Parse error on line 3:
...wchart TD  A --> Bgraph LR  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 'GRAPH'

Why it happens

Two answers were pasted together, so a second flowchart or graph line appears in the middle. The parser reads it as part of the previous statement.

The source that fails

flowchart TD
  A --> B
graph LR
  C --> D

How to fix it

Keep one declaration and merge the statements beneath it.

flowchart TD
  A --> B
  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.