Issue with StateParams

[p3pp8]

uirouter/core v6.1.0. I'm facing this issue:

modules.js?hash=5f47…9fe47f2ba01d:280243 TypeError: Cannot read properties of undefined (reading 'inherit')
    at StateParams.$inherit (modules.js?hash=5f47…47f2ba01d:309683:55)
    at StateService.href (modules.js?hash=5f47…47f2ba01d:311445:34)
    at BaseUrlRule.handler (modules.js?hash=5f47…47f2ba01d:313502:24)
    at UrlService.sync (modules.js?hash=5f47…47f2ba01d:313756:39)
    at modules.js?hash=5f47…7f2ba01d:313788:104
    at modules.js?hash=5f47…7f2ba01d:304237:125
    at Array.forEach (<anonymous>)
    at modules.js?hash=5f47…47f2ba01d:304237:94
    at Scope.$broadcast (modules.js?hash=5f47…47f2ba01d:284396:28)
    at afterLocationChange (modules.js?hash=5f47…47f2ba01d:280073:18)

Thanx for your help, really appreciated!