nil pointer dereference

[eckyputrady]

I'm simulating traffic of 5 concurrent users, and the server consistently throws this error after a while, and subsequent requests will return 500 ERROR.

I run the production build.

Just letting you know 🙂

2023/07/08 16:08:39 [Recovery] 2023/07/08 - 16:08:39 panic recovered:
GET /api/articles/lglnqbloiq-qv5xm3z40xzp/comments? HTTP/1.1
Host: localhost:8085
Authorization: *


runtime error: invalid memory address or nil pointer dereference
/usr/local/Cellar/go/1.20.5/libexec/src/runtime/panic.go:260 (0x104ae7c)
	panicmem: panic(memoryError)
/usr/local/Cellar/go/1.20.5/libexec/src/runtime/signal_unix.go:841 (0x104ae4c)
	sigpanic: panicmem()
/Users/ecky/Projects/realworld-gin-sqlc/api/article_handler.go:872 (0x18473dc)
	(*Server).GetComments: authorIDs = append(authorIDs, *comment.AuthorID)
/Users/ecky/go/pkg/mod/github.com/gin-gonic/[email protected]/context.go:174 (0x154d761)
	(*Context).Next: c.handlers[c.index](c)
/Users/ecky/go/pkg/mod/github.com/gin-gonic/[email protected]/recovery.go:102 (0x154d74c)
	CustomRecoveryWithWriter.func1: c.Next()
/Users/ecky/go/pkg/mod/github.com/gin-gonic/[email protected]/context.go:174 (0x154c886)
	(*Context).Next: c.handlers[c.index](c)
/Users/ecky/go/pkg/mod/github.com/gin-gonic/[email protected]/logger.go:240 (0x154c869)
	LoggerWithConfig.func1: c.Next()
/Users/ecky/go/pkg/mod/github.com/gin-gonic/[email protected]/context.go:174 (0x154b90a)
	(*Context).Next: c.handlers[c.index](c)
/Users/ecky/go/pkg/mod/github.com/gin-gonic/[email protected]/gin.go:620 (0x154b591)
	(*Engine).handleHTTPRequest: c.Next()
/Users/ecky/go/pkg/mod/github.com/gin-gonic/[email protected]/gin.go:576 (0x154b0bc)
	(*Engine).ServeHTTP: engine.handleHTTPRequest(c)
/usr/local/Cellar/go/1.20.5/libexec/src/net/http/server.go:2936 (0x12f7475)
	serverHandler.ServeHTTP: handler.ServeHTTP(rw, req)
/usr/local/Cellar/go/1.20.5/libexec/src/net/http/server.go:1995 (0x12f2991)
	(*conn).serve: serverHandler{c.server}.ServeHTTP(w, w.req)
/usr/local/Cellar/go/1.20.5/libexec/src/runtime/asm_amd64.s:1598 (0x1067b60)
	goexit: BYTE	$0x90	// NOP

[GIN] 2023/07/08 - 16:08:39 | 500 |    2.475358ms |             ::1 | GET      "/api/articles/lglnqbloiq-qv5xm3z40xzp/comments"