Problem after upgrade to 0.55.0

Hugo Static Site Generator v0.55.0/extended darwin/amd64 BuildDate: unknown
GOOS=“darwin”
GOARCH=“amd64”
GOVERSION=“go1.12.2”


hugo server
: net/url: invalid control character in URL

goroutine 53 [running]:
github.com/gohugoio/hugo/helpers.(*PathSpec).URLEscape(0xc0001f4420, 0xc013665750, 0x9, 0x10000, 0xc013665750)
/private/tmp/hugo-20190408-28309-14khmyf/hugo-0.55.0/src/github.com/gohugoio/hugo/helpers/url.go:121 +0x87

with --debug it happens after:
INFO 2019/04/09 14:04:39 found taxonomies: map[string]string{“category”:“categories”, “tag”:“tags”}

how can I find where is the problem?