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2021-05-05 13-05-18
Mykola (Nick) Tkachenko
Champion
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5Comments
Reduce of empty array with no initial value error on Scroll
Question

Hi,

I'm currently having strange error on my console when scrolling the page on mobile app:
Uncaught TypeError: Reduce of empty array with no initial value
    at Array.reduce (<anonymous>)
    at t.getCurrentScrollViewerState (virtualized-scroll-viewer.js:708)
    at virtualized-scroll-viewer.js:399

I'm a bit confused with it. Any suggestions of how to identify source of the problem are welcomed.

Thanks.


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23 Oct 2018
2020-02-28 09-46-54
Eduardo Jauch
mvp_badge
MVP

Hi Mykola,

Never encountered this error. Being a JavaScript error and by the place and trigger, it is something that is happening in automatic generated code.

What do you have in this screen?

Cheers.


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24 Oct 2018

Hi Eduardo,

There are lots of things on that screen including tabs and lists. But I've noticed that this error only happens if I start scrolling while the page is not fully loaded (some data for lists is still be fetching). If I wait till all is done - no error.

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24 Oct 2018
2020-02-28 09-46-54
Eduardo Jauch
mvp_badge
MVP

Hum...

This is interesting.
Seems like a bad "interaction" that is not being taking into account by the automatic code.

If it is this, it would be a bug.

I would open a ticket with support, sending them a small test app that can reproduce the problem.

Cheers.

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24 Oct 2018

Hi, may i know is any finding for this? i encounter same problem in Outsystems 11. 

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10 Jun 2021

We were experiencing the same issue  (on a screen with accordion items in a list) and were able to solve it by setting disable-virtualization = True on the list 


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18 Mar
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