Error on loading new image for voting - "undefined is not an object (evaluating '_.value.current.history.length)"

[ajvol]

Safari 26.0.1 (20622.1.22.118.4)

On page https://montage.toolforge.org/#/vote/4025-round-1

The error occurs randomly, approximately after every 4 voted images.

[Error] TypeError: undefined is not an object (evaluating '_.value.current.history.length') — index-Dpc02S4K.js:29136
	_D (index-Dpc02S4K.js:13:668)
	yf (index-Dpc02S4K.js:13:601)
	gy (index-Dpc02S4K.js:13:35331)
	R (index-Dpc02S4K.js:13:26890)
	run (index-Dpc02S4K.js:9:1811)
	runIfDirty (index-Dpc02S4K.js:9:2122)
	Lu (index-Dpc02S4K.js:13)
	Aw (index-Dpc02S4K.js:13:1802)

[ajvol]

A similar error in Chrome "TypeError: Cannot read properties of undefined (reading 'length')"

[lgelauff]

@ajvol Do you get a blank screen? Is there any way you could make a video of you reproducing the error, showing step by step how you get there?

If you know some example images that trigger this somehow - this might also be helpful. From what you're describing, it sounds like it's not entirely predictable (i.e. not exactly every 4 images, but somewhat random?)

[ajvol]

@lgelauff Thank you for your work! Today, the problem is much more common - in most cases, the photo does not load.

https://drive.google.com/file/d/1SNDyBYgoVLz-vEIxkaOrZ8nLZfGPJqcA/view?usp=sharing

I see similar behavior in other browsers.

[ajvol]

@lgelauff one more video with "network" tab - this time in Chrome/YaBrowser

https://drive.google.com/file/d/1wPsIrA5-tIezHiQYpHF9oyu2xMmsoGVw/view?usp=sharing

I see a list of files for voting in api.php ? action=query.

I saw a sequence of 4 successfully submitted requests.

Then the error occurred.

And then the error

[ajvol]

@lgelauff yet another observation

the problem arises in elements like this

descriptionurl does not match title perhaps because of the file renaming (and redirect) on Commons

look at mismatch: "22" and "23" at the end of filename

            "175907966": {
                "pageid": 175907966,
                "ns": 6,
                "title": "File:\u0426\u0435\u0440\u043a\u043e\u0432\u044c \u0421\u043f\u0430\u0441\u0441\u043a\u0430\u044f, \u0422\u0451\u0441\u043e\u0432\u043e, \u041d\u043e\u0432\u043e\u0434\u0443\u0433\u0438\u043d\u0441\u043a\u0438\u0439 \u0440\u0430\u0439\u043e\u043d 23.jpg",
                "imagerepository": "local",
                "imageinfo": [
                    {
                        "timestamp": "2025-09-28T18:13:45Z",
                        "user": "\u0410\u043b\u0435\u043a\u0441\u0430\u043d\u0434\u0440 \u0410\u043d\u0442\u043e\u043d\u043e\u0432 \u0433\u0443\u0433\u043b-\u043a\u0430\u0440\u0442\u043e\u0432\u0441\u043a\u0438\u0439",
                        "userid": 12476606,
                        "size": 2412820,
                        "width": 4000,
                        "height": 3000,
                        "url": "https://upload.wikimedia.org/wikipedia/commons/d/d8/%D0%A6%D0%B5%D1%80%D0%BA%D0%BE%D0%B2%D1%8C_%D0%A1%D0%BF%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D1%8F%2C_%D0%A2%D1%91%D1%81%D0%BE%D0%B2%D0%BE%2C_%D0%9D%D0%BE%D0%B2%D0%BE%D0%B4%D1%83%D0%B3%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD_22.jpg",
                        "descriptionurl": "https://commons.wikimedia.org/wiki/File:%D0%A6%D0%B5%D1%80%D0%BA%D0%BE%D0%B2%D1%8C_%D0%A1%D0%BF%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D1%8F,_%D0%A2%D1%91%D1%81%D0%BE%D0%B2%D0%BE,_%D0%9D%D0%BE%D0%B2%D0%BE%D0%B4%D1%83%D0%B3%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD_22.jpg",
                        "descriptionshorturl": "https://commons.wikimedia.org/w/index.php?curid=175756709"
                    }
                ]
            },

see https://commons.wikimedia.org/w/index.php?title=File:Церковь_Спасская,_Тёсово,_Новодугинский_район_23.jpg&redirect=no

[ajvol]

Yet another experiment

tasks payload

api php payload

the first 4 photos from the task list were processed successfully, and an empty page was shown instead of the fifth photo (I couldn't vote for it, I didn't even see the photo)

If you look at the list in tasks payload, it is the fifth photo that contains the renaming.

https://commons.wikimedia.org/w/index.php?title=File:Церковь_Спасская,_Тёсово,_Новодугинский_район_32.jpg&redirect=no

5th element in tasks payload

            {
                "date": null,
                "entry": {
                    "height": 2811,
                    "id": 2061653,
                    "mime_major": "image",
                    "mime_minor": "jpeg",
                    "name": "\u0426\u0435\u0440\u043a\u043e\u0432\u044c_\u0421\u043f\u0430\u0441\u0441\u043a\u0430\u044f,_\u0422\u0451\u0441\u043e\u0432\u043e,_\u041d\u043e\u0432\u043e\u0434\u0443\u0433\u0438\u043d\u0441\u043a\u0438\u0439_\u0440\u0430\u0439\u043e\u043d_32.jpg",
                    "resolution": 9830067,
                    "upload_date": "2025-09-28T18:14:16",
                    "url": "https://upload.wikimedia.org/wikipedia/commons/9/97/%D0%A6%D0%B5%D1%80%D0%BA%D0%BE%D0%B2%D1%8C_%D0%A1%D0%BF%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D1%8F%2C_%D0%A2%D1%91%D1%81%D0%BE%D0%B2%D0%BE%2C_%D0%9D%D0%BE%D0%B2%D0%BE%D0%B4%D1%83%D0%B3%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD_32.jpg",
                    "url_med": "https://upload.wikimedia.org/wikipedia/commons/thumb/9/97/%D0%A6%D0%B5%D1%80%D0%BA%D0%BE%D0%B2%D1%8C_%D0%A1%D0%BF%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D1%8F%2C_%D0%A2%D1%91%D1%81%D0%BE%D0%B2%D0%BE%2C_%D0%9D%D0%BE%D0%B2%D0%BE%D0%B4%D1%83%D0%B3%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD_32.jpg/480px-%D0%A6%D0%B5%D1%80%D0%BA%D0%BE%D0%B2%D1%8C_%D0%A1%D0%BF%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D1%8F%2C_%D0%A2%D1%91%D1%81%D0%BE%D0%B2%D0%BE%2C_%D0%9D%D0%BE%D0%B2%D0%BE%D0%B4%D1%83%D0%B3%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD_32.jpg",
                    "url_sm": "https://upload.wikimedia.org/wikipedia/commons/thumb/9/97/%D0%A6%D0%B5%D1%80%D0%BA%D0%BE%D0%B2%D1%8C_%D0%A1%D0%BF%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D1%8F%2C_%D0%A2%D1%91%D1%81%D0%BE%D0%B2%D0%BE%2C_%D0%9D%D0%BE%D0%B2%D0%BE%D0%B4%D1%83%D0%B3%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD_32.jpg/240px-%D0%A6%D0%B5%D1%80%D0%BA%D0%BE%D0%B2%D1%8C_%D0%A1%D0%BF%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D1%8F%2C_%D0%A2%D1%91%D1%81%D0%BE%D0%B2%D0%BE%2C_%D0%9D%D0%BE%D0%B2%D0%BE%D0%B4%D1%83%D0%B3%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD_32.jpg",
                    "width": 3497
                },
                "id": 8496779,
                "is_fave": false,
                "name": "\u0426\u0435\u0440\u043a\u043e\u0432\u044c_\u0421\u043f\u0430\u0441\u0441\u043a\u0430\u044f,_\u0422\u0451\u0441\u043e\u0432\u043e,_\u041d\u043e\u0432\u043e\u0434\u0443\u0433\u0438\u043d\u0441\u043a\u0438\u0439_\u0440\u0430\u0439\u043e\u043d_32.jpg",
                "review": null,
                "round_id": 4025,
                "user": "\u0410\u043b\u0435\u043a\u0441\u0430\u043d\u0434\u0440 \u0421\u0438\u0433\u0430\u0447\u0451\u0432",
                "value": null
            },

corresponding element in api.php payload (file name mismatch due to redirecting on Commons)

            "175907923": {
                "pageid": 175907923,
                "ns": 6,
                "title": "File:\u0426\u0435\u0440\u043a\u043e\u0432\u044c \u0421\u043f\u0430\u0441\u0441\u043a\u0430\u044f, \u0422\u0451\u0441\u043e\u0432\u043e, \u041d\u043e\u0432\u043e\u0434\u0443\u0433\u0438\u043d\u0441\u043a\u0438\u0439 \u0440\u0430\u0439\u043e\u043d 32.jpg",
                "imagerepository": "local",
                "imageinfo": [
                    {
                        "timestamp": "2025-09-28T18:14:13Z",
                        "user": "\u0410\u043b\u0435\u043a\u0441\u0430\u043d\u0434\u0440 \u0410\u043d\u0442\u043e\u043d\u043e\u0432 \u0433\u0443\u0433\u043b-\u043a\u0430\u0440\u0442\u043e\u0432\u0441\u043a\u0438\u0439",
                        "userid": 12476606,
                        "size": 2118390,
                        "width": 3497,
                        "height": 2811,
                        "url": "https://upload.wikimedia.org/wikipedia/commons/b/b4/%D0%A6%D0%B5%D1%80%D0%BA%D0%BE%D0%B2%D1%8C_%D0%A1%D0%BF%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D1%8F%2C_%D0%A2%D1%91%D1%81%D0%BE%D0%B2%D0%BE%2C_%D0%9D%D0%BE%D0%B2%D0%BE%D0%B4%D1%83%D0%B3%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD_31.jpg",
                        "descriptionurl": "https://commons.wikimedia.org/wiki/File:%D0%A6%D0%B5%D1%80%D0%BA%D0%BE%D0%B2%D1%8C_%D0%A1%D0%BF%D0%B0%D1%81%D1%81%D0%BA%D0%B0%D1%8F,_%D0%A2%D1%91%D1%81%D0%BE%D0%B2%D0%BE,_%D0%9D%D0%BE%D0%B2%D0%BE%D0%B4%D1%83%D0%B3%D0%B8%D0%BD%D1%81%D0%BA%D0%B8%D0%B9_%D1%80%D0%B0%D0%B9%D0%BE%D0%BD_31.jpg",
                        "descriptionshorturl": "https://commons.wikimedia.org/w/index.php?curid=175756758"
                    }
                ]
            },

[lgelauff]

This is really helpful - if the renaming would be responsible for this error, this would also explain why this Russian dataset is having more trouble than other campaigns: for one reason or another, it may contain more renamed files. It doesn't change that it should be solved, but helps explain a lot!

[atsirlin]

@mahmoud, would it be possible to remove this photo:
https://commons.wikimedia.org/w/index.php?title=File:Церковь_Спасская,_Тёсово,_Новодугинский_район_23.jpg
from the current round of campaign #965? Then we could verify that it really solves the issue.

[lgelauff]

When I try to import that image to a new campaign, it is rejected due to 'import issues'.
I see that the page is a redirect, but maybe the round was created while it was still a (duplicate) file. So while the page/file was deleted, it also still exists as a redirect. And the round was probably created just before or around the same time as this happened. which is an edge case I wouldn't have thought of...

[ajvol]

Yet another (imaginary) case: image was deleted on Commons as copyright violation during the round