error go

2019/06/26 10:13:52 [Recovery] 2019/06/26 - 10:13:52 panic recovered:
GET /ping HTTP/1.1
Host: localhost:8080
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.5
Cache-Control: max-age=0
Connection: keep-alive
Dnt: 1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:67.0) Gecko/20100101 Firefox/67.0


runtime error: invalid memory address or nil pointer dereference
/usr/local/go/src/runtime/panic.go:82 (0x442320)
	panicmem: panic(memoryError)
/usr/local/go/src/runtime/signal_unix.go:390 (0x44214f)
	sigpanic: panicmem()
/usr/local/go/src/html/template/template.go:95 (0x78dacd)
	(*Template).escape: t.nameSpace.mu.Lock()
/usr/local/go/src/html/template/template.go:119 (0x78dd2e)
	(*Template).Execute: if err := t.escape(); err != nil {
/home/yuko/go/src/github.com/gin-gonic/gin/render/html.go:84 (0x8c837f)
	HTML.Render: return r.Template.Execute(w, r.Data)
/home/yuko/go/src/github.com/gin-gonic/gin/context.go:808 (0x8d206e)
	(*Context).Render: if err := r.Render(c.Writer); err != nil {
/home/yuko/go/src/github.com/gin-gonic/gin/context.go:818 (0x8d2145)
	(*Context).HTML: c.Render(code, instance)
/home/yuko/go/src/github.com/yupangestu/gin/main.go:23 (0x8e553d)
	main.func2: c.HTML(http.StatusOK, "templates/example.html", gin.H{
/home/yuko/go/src/github.com/gin-gonic/gin/context.go:147 (0x8ce1f9)
	(*Context).Next: c.handlers[c.index](c)
/home/yuko/go/src/github.com/gin-gonic/gin/recovery.go:83 (0x8e18b9)
	RecoveryWithWriter.func1: c.Next()
/home/yuko/go/src/github.com/gin-gonic/gin/context.go:147 (0x8ce1f9)
	(*Context).Next: c.handlers[c.index](c)
/home/yuko/go/src/github.com/gin-gonic/gin/logger.go:240 (0x8e0960)
	LoggerWithConfig.func1: c.Next()
/home/yuko/go/src/github.com/gin-gonic/gin/context.go:147 (0x8ce1f9)
	(*Context).Next: c.handlers[c.index](c)
/home/yuko/go/src/github.com/gin-gonic/gin/gin.go:391 (0x8d7df9)
	(*Engine).handleHTTPRequest: c.Next()
/home/yuko/go/src/github.com/gin-gonic/gin/gin.go:352 (0x8d74ed)
	(*Engine).ServeHTTP: engine.handleHTTPRequest(c)
/usr/local/go/src/net/http/server.go:2774 (0x6b2da7)
	serverHandler.ServeHTTP: handler.ServeHTTP(rw, req)
/usr/local/go/src/net/http/server.go:1878 (0x6ae990)
	(*conn).serve: serverHandler{c.server}.ServeHTTP(w, w.req)
/usr/local/go/src/runtime/asm_amd64.s:1337 (0x459bc0)
	goexit: BYTE	$0x90	// NOP