Google GA4: Multiple installations of Global site tag (gtag.js) detected

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Topic summary

A user encountered a “Multiple installations of Global site tag (gtag.js) detected” error in Google Tag Assistant Legacy after setting up a new GA4 property and linking it to their Shopify store (julibees.com).

Resolution:

  • The issue was resolved by checking for conflicting apps or browser extensions
  • Specifically, the user identified that a VPN or ad block app was causing the duplicate gtag detection
  • Despite the error message, only one gtag code was actually present in the site’s code when checked in the IDE

Status: Resolved. The problem stemmed from third-party tools interfering with tag detection rather than actual duplicate code installations.

Summarized with AI on November 19. AI used: claude-sonnet-4-5-20250929.
1

Site: julibees.com

Problems: for some reasons, I have re-setup a new GA4 and successfully linked to Shopify. However, I have checked any problems with Google Tag Assistant Legacy, then it shows:

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Shawn512_0-1684997816176.png531×730 19.2 KB

I have checked all my codes in IDE, but it shows only one gtag in my code. any idea?

06a602ae709ce26b2fe9813cdbc779e.png
06a602ae709ce26b2fe9813cdbc779e.png740×694 21.3 KB

2

I solved it by myself-,-

Thanks

3

Hey, I am having the same issue. How did you fix it?

4

Check if are using any VPN or ads block app.