Bing custom Search UI crashes when customizing theme

Question

Bing custom Search UI crashes when customizing theme

FWindischNCM 0

We are using Bing Search Hosted UI using the JavaScript snippet on multiple customer websites.
Any Custom Search Instances using a customized color theme crashes about 99% of the time with a Server-Error.

The request fails with an HTTP-Status of 500 and responds with the following error:

{"error":{"code":"ServerError","message":"A server error occured"}}

This error happens in the preview mode as well as in production.

In screenshot below the instance is set to the normal classic theme with no customization, notice the preview is working normally. User's image

As soon as i edit even one color variable it fails. User's image

romungi-MSFT 49,096 Reputation points Microsoft Employee Moderator

2025-01-13T07:47:00.9133333+00:00

@FWindischNCM Yes, I see the same issue with customization. It seems like only the CSS themes BingDefault and SkyBlue are working currently. Any customization is throwing a 500 error from ui.customsearch.ai

Let me report this internally to check if there is a workaround or if it needs to be fixed. Thanks!!

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romungi-MSFT 49,096 Reputation points Microsoft Employee Moderator

2025-01-13T07:47:00.9133333+00:00

@FWindischNCM Yes, I see the same issue with customization. It seems like only the CSS themes BingDefault and SkyBlue are working currently. Any customization is throwing a 500 error from ui.customsearch.ai

Let me report this internally to check if there is a workaround or if it needs to be fixed. Thanks!!

Answer 1

romungi-MSFT 49,096 Microsoft Employee Moderator

@FWindischNCM This should now be fixed in custom search portal. Here is a screenshot from my customization that works without the error.

User's image

Could you please retry the scenario again?

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

FWindischNCM 0 Reputation points

2025-01-21T09:35:49.9733333+00:00

@romungi-MSFT It is working now in Preview, but in Production it still crashes.

Here it is working in Preview:

But the JS-Snippet is crashing:

And the HTML-Endpoint is also crashing:
FWindischNCM 0 Reputation points

2025-01-21T09:39:18.6066667+00:00

@romungi-MSFT It is working in Preview now, but Production still crashes.

Here it is working in Preview:

But the JS-Snippet is crashing:

And the HTML-Endpoint is also crashing:
romungi-MSFT 49,096 Reputation points Microsoft Employee Moderator

2025-01-27T10:47:24.3466667+00:00

@FWindischNCM Apologies for the delay. I just noticed this and tested the web and JS snippet. It seems like both are working now.

Could you please check again?
FWindischNCM 0 Reputation points

2025-01-28T11:17:44.9233333+00:00

@romungi-MSFT Now it works for one of our customers, but another is broken in both Preview and Snippet again.

Here's the preview after i click on customize theme, but don't change anything yet:

And here is as soon as i change even a single color (to a valid hex-color of course):
FWindischNCM 0 Reputation points

2025-04-07T08:00:32.8866667+00:00

@romungi-MSFT

It just broke for another customer and it basically barely ever works for any of our customers.

Can you report this bug internally again?

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Bing custom Search UI crashes when customizing theme

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