Alphatex fails to render with chord names and diagrams

[chris-saunders]

Your environment

• Version used: Dev branch
• Platform used: JavaScript
• Rendering engine used: SVG
• Browser Name and Version: Chrome, Firefox, Opera
• Operating System and version: Desktop (MacOS Mojave 10.14)
• Link to your project:

Expected Results

Alphatab renders the sheet music, chord diagrams names and all.

Observed Results

Alphatab JS crashes before rendering.
AlphaTab.js:2642 Uncaught TypeError: Cannot read property 'cmd' of null at AlphaTab.js:2642
Seems that $global.data is null, which prevents rendering and when the render message is logged it crashes because there is no information associated with it.

Steps to Reproduce (for bugs)

Here is the alphatex which causes the bug.
Important to note, alphatab renders fine on other pieces of sheet music with chord names and diagrams, and it also works fine if you remove all chord names and diagrams from the piece linked below. Another way to get the piece to render is to remove a fairly large amount of bars while leaving the chord information in.

It also renders on Safari with no issues. Have not tested with IE or Edge.

bohemianRhapsody.txt

Possible Solution

It seems to be an issue related to size of the file and rendering chord names and diagrams.

[Danielku15]

It is likely that there is some syntax error in the alphaTex overall but it is not properly reported due to another error. Maybe until the bug is fixed you can try simplifying the file and try to find which "bar" is causing the issue. Just from a first guess, I fear that the # sign is causing the issue. It might not be treated as valid character in the name.

[chris-saunders]

Thank you very much for the quick response. I have tried both removing '#'s from the file and removing bars until it works. Unfortunately neither has yielded useful results. Removing '#' continues to fail to render.
As for simplifying the file, it does start working after removing a good chunk of the piece, but it does not seem to matter which bar I remove.
I would have thought if there is an issue in the alphaTex that it would not render on all browsers, but it still works fine on Safari.
It also only works if there is no chord information at all. Leaving a single diagram or chord annotation is enough to stop it from working.

[Danielku15]

The problem is fixed with the latest changes in the develop branch. There was a cycic reference when the song was serialized. With my changes your song is working fine.