Inconsistency of return of "hs.application.kind" leads to unexpected behavior of "hs.window.filter"

If Barrier has a window when calling "hs.window.filter", "hs.application.kind" returns 1, so "hs.window.filter" works well. But if Barrier has no window, "hs.application.kind" returns -1, that means "hs.window.filter" never starts an appwatcher for Barrier unless it is once activated. Are there any workarounds for this issue?