reflect: call of reflect.Value.Type on zero Value

[microo8]

I've got this error, don't know what's going on

Using the latest gqlparser and gqlparser.

goroutine 209 [running]:
runtime/debug.Stack()
	/usr/lib/go/src/runtime/debug/stack.go:24 +0x65
runtime/debug.PrintStack()
	/usr/lib/go/src/runtime/debug/stack.go:16 +0x19
github.com/99designs/gqlgen/graphql.DefaultRecover({0xc0001226c0?, 0x0?}, {0x1052760?, 0xc00059f410?})
	/home/micro/.go/pkg/mod/github.com/99designs/gqlgen@v0.17.3-0.20220411111311-9f5fad13fa62/graphql/recovery.go:17 +0x71
github.com/99designs/gqlgen/graphql/executor.(*Executor).PresentRecoveredError(0xc000119a40, {0x1359630, 0xc000542930}, {0x1052760?, 0xc00059f410?})
	/home/micro/.go/pkg/mod/github.com/99designs/gqlgen@v0.17.3-0.20220411111311-9f5fad13fa62/graphql/executor/executor.go:143 +0x46
github.com/99designs/gqlgen/graphql/handler.(*Server).ServeHTTP.func1()
	/home/micro/.go/pkg/mod/github.com/99designs/gqlgen@v0.17.3-0.20220411111311-9f5fad13fa62/graphql/handler/server.go:104 +0x99
panic({0x1052760, 0xc00059f410})
	/usr/lib/go/src/runtime/panic.go:838 +0x207
reflect.Value.Type({0x0?, 0x0?, 0x122a902?})
	/usr/lib/go/src/reflect/value.go:2451 +0x12e
github.com/vektah/gqlparser/v2/validator.(*varValidator).validateVarType(0xc0000ee800, 0xc00048ff50, {0x0?, 0x0?, 0x100f340?})
	/home/micro/.go/pkg/mod/github.com/vektah/gqlparser/v2@v2.4.2-0.20220410185821-5bb131d67faa/validator/vars.go:105 +0xc96
github.com/vektah/gqlparser/v2/validator.(*varValidator).validateVarType(0xc0000ee800, 0xc00048ff20, {0xffd760?, 0xc00059f3e0?, 0xc00006dc50?})
	/home/micro/.go/pkg/mod/github.com/vektah/gqlparser/v2@v2.4.2-0.20220410185821-5bb131d67faa/validator/vars.go:119 +0xf7c
github.com/vektah/gqlparser/v2/validator.(*varValidator).validateVarType(0xc0000ee800, 0xc000588d50, {0x1062400?, 0xc00025be90?, 0xbc373d?})
	/home/micro/.go/pkg/mod/github.com/vektah/gqlparser/v2@v2.4.2-0.20220410185821-5bb131d67faa/validator/vars.go:231 +0x15c5
github.com/vektah/gqlparser/v2/validator.VariableValues(0xc0001780a0, 0xc0005298f0, 0xc0000c8090?)
	/home/micro/.go/pkg/mod/github.com/vektah/gqlparser/v2@v2.4.2-0.20220410185821-5bb131d67faa/validator/vars.go:77 +0x5ce
github.com/99designs/gqlgen/graphql/executor.(*Executor).CreateOperationContext(0xc000119a40, {0x1359630, 0xc00025bdd0}, 0xc00011dc20)
	/home/micro/.go/pkg/mod/github.com/99designs/gqlgen@v0.17.3-0.20220411111311-9f5fad13fa62/graphql/executor/executor.go:74 +0x48c
github.com/99designs/gqlgen/graphql/handler/transport.(*wsConnection).subscribe(0xc0002a60f0, {0xc000542930?, 0xc000171040?, 0x1a93380?}, 0xc0005435c0)
	/home/micro/.go/pkg/mod/github.com/99designs/gqlgen@v0.17.3-0.20220411111311-9f5fad13fa62/graphql/handler/transport/websocket.go:307 +0x22d
github.com/99designs/gqlgen/graphql/handler/transport.(*wsConnection).run(0xc0002a60f0)
	/home/micro/.go/pkg/mod/github.com/99designs/gqlgen@v0.17.3-0.20220411111311-9f5fad13fa62/graphql/handler/transport/websocket.go:237 +0x629
github.com/99designs/gqlgen/graphql/handler/transport.Websocket.Do({{0x0, 0x0, 0x0, {0x0, 0x0}, {0xc000044120, 0x2, 0x2}, 0x0, 0x0, ...}, ...}, ...)
	/home/micro/.go/pkg/mod/github.com/99designs/gqlgen@v0.17.3-0.20220411111311-9f5fad13fa62/graphql/handler/transport/websocket.go:94 +0x311
github.com/99designs/gqlgen/graphql/handler.(*Server).ServeHTTP(0xc00054c480, {0x1358ef0, 0xc00021a380}, 0xc00009a600)
	/home/micro/.go/pkg/mod/github.com/99designs/gqlgen@v0.17.3-0.20220411111311-9f5fad13fa62/graphql/handler/server.go:120 +0x33d

[microo8]

I was sending invalid json value [null] for a field with [][]string type

[StevenACoffman]

Glad you figured it out, but I'm sorry we didn't do more to make that easier. @microo8 I would love a PR that gives a better error message in that situation.

[microo8]

The correct way would be, that it doesn't crash, but just responds to the client that the request isn't valid.
I would love to work on it, but have no time spare for it :/