Bug Description

Use cache middleware to cache home page "/".
Use CacheInvalidator to skip cache, got error: runtime error: index out of range [0] with length 0.

How to Reproduce

1.use cache middleware to cache home page "/".
2.do not visit "/" in browser, so there will not be any cache of it.
3.visit "/login" page to login, then CacheInvalidator would return true now.
4.visit "/".
5.got error.

Expected Behavior

When restart the program, not every page is cached, when user logged in visit no cache page, it should be open normal.

Fiber Version

v3.0.0-beta.3

Code Snippet (optional)

var WebCache_Home = cache.New(cache.Config{
	CacheInvalidator: auth.ValidateLogin,
	Expiration: 10 * time.Minute,
	KeyGenerator: func(c fiber.Ctx) string {
		cacheKey := "homeLogout"
		if auth.ValidateLogin(c){
			cacheKey = "homeLogin"
		}
		return cacheKey
	},
	StoreResponseHeaders: true,
	MaxBytes:             1 * 1024 * 1024,
})

app.Use("/:p<maxLen(0)>?", cache.WebCache_Home)
app.Get("/:p<maxLen(0)>?", user.HomeHandler)

Checklist:

• I agree to follow Fiber's Code of Conduct.
• I have checked for existing issues that describe my problem prior to opening this one.
• I understand that improperly formatted bug reports may be closed without explanation.