How to remove automatically added characters from URL?

Question

JavaScript

for some reason, on the Bitrix website, for some reason, it is added to each href at the end of the link, such symbols "? undefined " because of this, not all links work correctly, that is, they are added every time they are output, and the person already follows the link, which already contains this ?undefined . how to remove it? or disable the output of these characters?
I tried strstr this function and similar ones from php manually to remove these characters, but it does not help, the output is still with them. maybe with the help of js it is still possible to resolve this issue or php?

Answer 1

once undefined and hung on all links - js means coy. Search in scripts.