TypeError: Cannot read properties of undefined (reading 'x')

[stefanstranger]

Description

With Mermaid version 10.6.1. the following Mermaid code shows the error "TypeError: Cannot read properties of undefined (reading 'x')"

That Mermaid code was working in version 10.4.0. See following screenshot.

What has changed since version 10.4.0 that breaks the Mermaid diagram creation?

Steps to reproduce

1. Download following gist
2. Run Mermaid cli with latest version (e.g. via Docker) like this: docker run --rm -v c:/temp:/data minlag/mermaid-cli -i test.mmd
   This should give an error.
3. Run Mermaid cli with version 10.4.0 (e.g. via Docker) like this: docker run --rm -v c:/temp:/data minlag/mermaid-cli:10.4.0 -i test.mmd
   This should create an svg file.

Screenshots

Code Sample

https://develop.git.mermaid.live/edit?gist=https://gist.github.com/stefanstranger/2ba6b101308c9a18087ad90440a5902e#pako:eNqdWFtv0zAU_itTnunDJvGyB6RR2BigMS2Fp0lHbuy2Fqkd2Q5QEP-dYztNmhFf0j11yfF3vnP3yZ-ikpQV18VWkWZ3sXr7LC7wb6X4dsuU_0e3a_92KQXlhksBC1juWPUd-AY2vGbANQhpgAsoK8Ubo2Eja8rUYqVa5lEoV6yyh3sl9q9kggIRwPaE1wDfruD0nYEfRHGyRg0L-xPe1nJ9iwofidlFBa3QA9mzqJBFGYSQScxeKQzhgim4F9oQUTEoDTEMVkztucBfNGnsO1YzPEGg6sG2SrbNIHGHJGu5RfcpuR8J8k7rtEEhC26lAkaqHVzFeM20M6ns1sXeZkOPFle_b6S2QXHmowptoG1qSSijsCT4yiZZgG9WHg5nP3ONT216wBqTSY9Ydsx1yMKyko3luSQGzVxAVyZrSQ9QIU-ByQRUMs-C_bK68i23yX3C5WqQeyQKpT6WXx460c7DNoFP5QIV02P6Y83JqbCNtxjsuj7E6Htfejfa0rWnvAMnYh_WtFKHPpAbzKEpr8ZojLwTPpzvIOfWyxDtr8Jgq1pgbe4bV8-YdCZd-cQaefkaNMOipnp497JGj32gUegeZThmk9yEmkZP70XYLhaLNxkFmVUNDmtWkWYKd8DnFXOknzvc0GSZr6-DyxhGCaEQ0HhYRQRCAONBFgu7Q5jRA-8F-orU_Dd7qfNm-XRDcSI8Eq1_SkUdsg23ewrHx1CySuFTN9A-sQN8I21tPPiH1erRRkExO2BKIxXZMripKtkK4_mVO6K82S-Eb8oUQRT56lKuA-5wp8GOxZf0XS7nDHZW2MkmCZKT8NwNxR9GDzQ1B50f0pSWUb3NJpNC792TqWJcigkHJvCWXW9PcbR9Q1uO2oeQ-BCKNOOez1C3eeYlcMe9JFN_BmYfiZywZWCOW1akTtq1dt0YO_Y9TYA-MS1bVTEX4gF9otoTQOHqDCCm8aZ6Ucp4PzJn51YkK1Ma__NgQlWIYXCUTY6N04skdlyzY6AkjmI_f-Fkes-5M_ppefaV_ZyTE1el6Vt9XMbB5Fz64zKxi0tkJzjb8MnVYepiOmtxyEmOkfr8fWJ2NmWuGkmxGZE5XUZCq0fgwnv0Orx3jx6k4RteEdtKPV7udS1Ed-6F4ThWHV58jxq2IiccWqAyFqXxKnQ1CX_WF5D0x5oj9chXn5ma-1t2zleikOb_wpmRXdkbaZfuqYE4GuvFq2KPJhJOi-vij8V5LrDOsZyKa_xJ2cYtDcWz-IuipDWyPIiquN6QWrNXRdtQ9M07TnBB33dP__4DE8J05g

Setup

• Mermaid version: 10.6.1
• Browser and Version: Edge 119.0.2151.72

Suggested Solutions

No response

Additional Context

No response

[sidharthv96]

Thanks for reporting this @stefanstranger.
I've found the newly added issue and patched it. Will raise the PR once I've created a minimal reproduction and tests.
But the root cause is how the arrows between a subgraph, and its child, is handled.
Which would need a deeper inspection.

graph TB
    Out --> In
    subgraph Sub
      In
    end
    Sub --> In

graph TB
    Out --> In
    subgraph Sub
      In
    end
    Sub --> In

This is the issue, when there are links between an outside node and the subgraph to a node inside subgraph.