Issue Description

Checklist

• Dependencies installed
• No typos
• Searched existing issues and docs

Expected behaviour

Actual behaviour

Steps to reproduce

Working code to debug

package main import "github.com/labstack/echo/v4" func main() { e := echo.New() e.HTTPErrorHandler = HTTPErrorHandler e.GET("/test1", test1Handler) e.GET("/test2", test2Handler) e.RouteNotFound("/*", indexHandler) g := e.Group("/admin") g.GET("/test1", adminTest1Handler) g.GET("/test2", adminTest2Handler) g.RouteNotFound("/*", adminIndexHandler) }

Version/commit

Get path /test3 and will goto indexHandler, bug get /admin/test3 goto HTTPErrorHandler. The /admin/test3 goto adminIndexHandler is right.

The echo code have some test, but the bug is not checked.