Cannot read properties of undefined (reading 'name') in first line of every template

[SirPhoros]

In every template.hbs that I have, in the first, I seem to keep receiving the following error Cannot read properties of undefined (reading 'name')glimmer-engine(syntax)

However, there's no name in said templates, so I presumed it has something to do with the way glimmer-engine is configured, but I don't seem to catch where it is coming from.

It doesn't matter whether the first line is a moustache, a semantic tag or even a line break, it will report that said error occurs in the file (although, it does not prevent it from compiling and rendering).

Does anybody more experience have an idea of how to solve this annoying error?

[NullVoxPopuli]

thanks for reporting!

• what versions are you using?
• do you have a reproduction?

[SirPhoros]

Hi! Thank you so much for answering so quickly!

Well, in our package.json we have the following packages:

    "@glimmer/tracking": "^1.1.2",
   ... 
      "ember-cli": "4.12.2", 

And literally almost everything could be a reproduction, but for example:

<EmberTooltip
 @event={{this.event}}
 @isShown={{@isShown}}
 @side={{this.side}}
 @targetId={{@targetId}}
 @tooltipClass={{this.styleNamespace}}
 ...attributes
>
 {{#if @text}}
   {{@text}}
 {{else}}
   {{yield}}
 {{/if}}
</EmberTooltip>

Then, in the first line: Cannot read properties of undefined (reading 'name')glimmer-engine(syntax) when visibly, there's no instance that name has been mentioned. It can happen if we are just getting a blank line as first line, if it is a conditional or if we are opening a block as well.

However, we have a few instances like:

<div class={{this.styleNamespace}} ...attributes>
 {{yield}}
</div>

That seems not to trigger this problem.

Thinking about that, maybe the root resides on the component, but I cannot figure it out

[NullVoxPopuli]

so since this seems to be runtime error, what does the compiled output of your problematic template look like?

[SirPhoros]

That's the issue, everything looks correct, and nothing changed from when this flag started to appear.

[NullVoxPopuli]

a repro repo would be most helpful <3