GAM Ad Unit has Duplicate Div IDs on this page. Follow These Steps To Fix It.

This post was most recently updated on November 7th, 2021

The same div ID is loading more than once in a single page load. Device detection codes are possibly missing.

Troubleshooting:

OFF-page setup:

Step 1: Check your HB configuration and set the device dropdown accordingly.

Step 2: Open the webpage, right click > view page source

Step 3: CTRL + F the div ID in question. There should only be 1 result.

ON-page setup:

Step 1: Open the webpage, right click > view page source

Step 2: CTRL+F “defineslot” to locate GAM header tags

Step 3: If the publisher is using a separate set of ads on mobile vs desktop, check that device detection codes are set to properly load the ads based on device:

Step 4: Search the div ID’s. You should only see each body tag or div deployed once

Step 5: Using a mobile emulator, refresh the page to load mobile

Step 6: View the page source again and hunt down the duplicate ID

Step 7: If you see any duplicate IDs, remove them.

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