Tag Manager: Unable to reset Custom Dimension to "null" from JS variable

heurteph-ei · October 25, 2023, 3:30pm

Hi @cataclyst
This should have been fixed in Matomo 4.8.0:

github.com/matomo-org/tag-manager

TagManager (variable) values are not reset for tracking, even if they are set to "" or null.

opened 11:47PM - 22 Feb 22 UTC

closed 01:24AM - 25 Jan 23 UTC

peterbo

Bug

In an SPA, I'm tracking a pageView with a configuration using a bunch of custom …dimensions. (Virtual) PageViews are triggered by a custom event, that is pushed into the dataLayer with a bunch of variables. The problem is, that after setting a variable, e.g. "section" to a value (e.g. "test") in the first dataLayer push, and in a later push, you set it to "" or null, the triggered pageView will nevertheless send "test" as a custom dimension value. The Debugger correctly shows the variable as empty (""), but the issued requests contains the older value. It seems like the variable is not overwritten by the empty value in the tracker. Step1: Variable is defined with "TEST1234567" and gets correctly included into the request. ![TagManager1b](https://user-images.githubusercontent.com/1018973/155238932-fe5fc813-e553-429c-be6a-14bb60eb606e.png) Step2: Variable is defined with "" (empty string), but old value "TEST1234567" gets included into the request. ![TagManager2b](https://user-images.githubusercontent.com/1018973/155238933-bda8ffe7-07b5-4a4d-9fdf-5eb4539c4552.png)