Web browser and its version

latest safari version on iPhone

Operating system and its version

iOS latest

Can you reproduce this in any other browser, particularly in Firefox?

Also, please provide error messages and code as text rather than images.

Yes i can reproduce the same phenomenon on the iphone with the latest firefox app 137.0.0. In this case im using the latest unreleased pdf.js version: 5.2.47. From this page: "https://mozilla.github.io/pdf.js/web/viewer.html" bcs its easier for me to test.

As i dont have the same debug tools on the firefox mobile app i cant tell if its the same console error but its same behavior and consequence like in my previous safari tests. I can not longer draw the error happens after some zoom operations in combination with drawings. And other functions like text or text highlighting, annotations / drawing are not longer working. I tried same issue and same website with latest safari and have the same error:
TypeError: null is not an object (evaluating 'this.#touchMoveAC.abort')
This time i didnt even need to draw i just zoomed in and out "wildly" and the error popped up.

If you have an idea / something you want me to test im happy to do so.
This time i was even able to generate another error:
Unhandled Promise Rejection: TypeError: this.#currentEditorType.endDrawing is not a function. (In 'this.#currentEditorType.endDrawing(isAborted)', 'this.#currentEditorType.endDrawing' is undefined)

But i dont know if this one relates.

Both videos are firefox app 137.0.0. with the webpage mentioned above. Sorry for the shitty quality but otherwise file size is too big. But after some drawing i wasn't able to draw its just moving the page.

In the 2nd video you can see that the drawing in general is at the beginning weird and okayish and than after some time i cant draw at all.

Yes i can reproduce the same phenomenon on the iphone with the latest firefox app 137.0.0.

Please note that all browsers on iOS are effectively reskinned versions of Safari, because of limitations/restrictions in that platform.

Hence the more relevant question here, can you reproduce this issue anywhere other than on iOS devices?

Please note that Safari in general, even more so on iOS, has a lot of issues not found in other browsers. Hence why we only list Safari as "mostly" supported: https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions#faq-support

Yes im able to reproduce the error in chrome on my android tablet even tho i feel like its a bit more robust in chrome it didnt took me so long to reproduce. Basically same setup as before. I opened https://mozilla.github.io/pdf.js/web/viewer.html in chrome on my android and tried to zoom and used some annotations. I clearly see some kind of pattern but i can not pin point it yet. But its definitely the combination of zooming and annotations that are causing this.

Uncaught (in promise) TypeError: this[#currentEditorType].endDrawing is not a function
at AnnotationEditorLayer.endDrawingSession (annotation_editor_layer.js:868:36)
at AnnotationEditorLayer.commitOrRemove (annotation_editor_layer.js:889:12)
at AnnotationEditorUIManager.unselectAll (tools.js:2210:38)
at AnnotationEditorUIManager.updateMode (tools.js:1699:10)
at async updater (pdf_viewer.js:2412:7)

In chrome i always get this error. I got the same one in safari too as stated above but more often i got in safari:
TypeError: null is not an object (evaluating 'this.#touchMoveAC.abort')
And i mean I understand that safari is not so predictable but would it really crash so badly with such a determine error message?

There are two bugs here:

• the first one I don't really understand is because we're trying to abort an already aborted signal... It's easy to fix (even if I don't understand why).
• the second one can be intermittently reproduced while drawing on a touch screen and quickly click on an other tool button. In this case the current editor isn't committed (so we're still in drawing mode), we update the mode and then we want to commit the current drawing but the mode has been changed.