set a new route ctx if rctx is nil

Author: shedyfreak

middleware/url_format.go

@@ -55,6 +55,10 @@ func URLFormat(next http.Handler) http.Handler {
 			path = rctx.RoutePath
 		}
 
+		if rctx == nil {
+			rctx = chi.NewRouteContext()
+		}
+
 		if strings.Index(path, ".") > 0 {
 			base := strings.LastIndex(path, "/")
 			idx := strings.LastIndex(path[base:], ".")