Header bidding lets multiple ad exchanges compete for your inventory before the page loads, which typically increases revenue over a single ad network alone — but it also means several third-party scripts racing to load and respond within a tight time window, and when two of them conflict, the usual result is slower pages, failed bids, or both, silently costing you the revenue advantage header bidding was supposed to add.
Check the browser console for script errors during page load
Open your browser’s developer console (F12 or Cmd+Option+I) and reload a page with ads. Errors referencing your header bidding wrapper or a specific exchange’s script, especially timing-related messages, point directly at a conflict rather than a general slowness issue.
Header bidding script conflict resolution
Two header bidding scripts fighting over the same slot, found and untangled.
- Full backup taken before we start
- If we can’t fix it, you get your money back
- We never ask for your own password
This or something else?
| Console shows errors from header bidding scripts, or bids seem to be failing | This fix covers it |
| Ads work but pages are generally slow, no specific script errors | A broader performance diagnosis instead |
| You’re not running header bidding, just standard AdSense | Not applicable; this is specific to header bidding setups |
| Revenue has dropped and you’re not sure why yet | Ad revenue drop – technical diagnostic report, a broader look first |
What you are seeing
- Console errors referencing your header bidding wrapper or a specific exchange
- Slower page load specifically since header bidding was implemented
- Lower fill rates or bid response rates than expected from header bidding
- The issue possibly appearing after adding a new demand partner or updating the wrapper
Common causes
- Two ad partners’ scripts both attempting to control the same ad slot
- A timeout configuration too aggressive or too lenient for your actual page load characteristics
- A wrapper library conflicting with another script’s global variable or namespace
- Duplicate initialisation of the header bidding wrapper from a caching or loading issue
- An outdated integration for a specific demand partner no longer matching their current API
What we do
- Identify the specific conflicting scripts from console errors and network behaviour
- Review the header bidding wrapper’s configuration for the identified conflict
- Resolve the conflict, adjusting timing, namespacing, or partner configuration as needed
- Test that all configured demand partners can bid without interference
- Confirm page load performance is restored to expected levels
- Verify actual bid response and fill rates improve following the fix
What is included
- The specific script conflict identified and resolved
- Verified bidding from all configured demand partners
- Performance confirmed restored following the fix
- A written note on what was conflicting and why
Not included
- Adding new demand partners or exchanges, a separate configuration task
- Negotiating or managing relationships with ad exchanges directly
- Guaranteeing a specific revenue increase, which depends on market demand beyond technical setup
- Ongoing maintenance as partners update their own integration requirements
Questions about this fix
How much is this actually costing me while it's broken?
Hard to quantify precisely without knowing your specific bid volumes, but a genuine script conflict can measurably suppress bid response, which is lost revenue that a working setup would have captured.
Do I need to understand header bidding technically to order this?
No — you don't need to know the technical details, just confirm you're running header bidding and having the issues described, and we handle identifying and resolving the specific conflict.
Could adding a new ad partner cause this again later?
It's a real risk, since each new integration is another script that has to coexist with everything already running — we can advise on testing new partners carefully if you add more later.
Will this fix require taking my ads offline temporarily?
Not necessarily a full outage, though changes are tested carefully to avoid disrupting bidding during the fix itself.
Is header bidding worth the complexity if this kind of issue can happen?
For many sites with meaningful ad traffic, yes — the increased competition for inventory generally outweighs the added complexity, though it does require more careful maintenance than a single ad network.
Related fixes
If this is the second time this year
A bad update breaking the site is a symptom of updates not being tested first. Care plans run every update on a staging clone before it reaches your live site, which is the actual fix for this happening again.
Your access, your rules
Create a separate admin account for us and delete it when we are done. For anything else, we get in touch and agree a method — never a form field on this site, never by reply to an email.
We back up first, always
Before anything is touched we take a full backup and keep it for 30 days. If a fix goes wrong, we put the site back exactly as it was.
If it is not what you bought
If the problem turns out smaller than what you ordered, we refund the difference. If it is bigger, we stop and send a quote before doing any extra work.
If we cannot fix it
You get back what we received. Diagnosis is on us — you only pay when the problem is actually solved. The payment processor takes its fee before the money reaches us, so we never hold it and it is not ours to return. That is true here as everywhere else.
If it comes back
Reply within seven days of delivery and we put it back on the bench at no cost. The fix is not finished until it holds.
What we are responsible for
If something goes wrong with a fix, our responsibility is limited to what you paid for it. We take a full backup first so mistakes can be undone, and we tell you before doing anything outside what you bought.