crash on adding to group

2026/03/27 18:44:04 listening on :8080
2026/03/27 18:45:17 read error: failed to read JSON message: failed to get reader: received close frame: status = StatusNoStatusRcvd and reason = ""
2026/03/27 18:45:17 http: panic serving 127.0.0.1:54644: runtime error: invalid memory address or nil pointer dereference
goroutine 25 [running]:
net/http.(*conn).serve.func1()
        /usr/lib/go/src/net/http/server.go:1907 +0xbd
panic({0x8e0f20?, 0xe2b190?})
        /usr/lib/go/src/runtime/panic.go:860 +0x13a
github.com/coder/websocket.(*Conn).casClosing(...)
        /home/ffus/go/pkg/mod/github.com/coder/websocket@v1.8.14/close.go:325
github.com/coder/websocket.(*Conn).CloseNow(0x2d8e00000002?)
        /home/ffus/go/pkg/mod/github.com/coder/websocket@v1.8.14/close.go:135 +0x48
main.closeConnection(0x2d8ef7ddd990?, 0xb8?)
        /home/ffus/Projects/go-socket/wsServer.go:183 +0x2d
main.ServeWsConnection({0x9c4a68?, 0x2d8ef7ee41e0?}, 0x2d8ef7d5db30?)
        /home/ffus/Projects/go-socket/wsServer.go:36 +0x350
net/http.HandlerFunc.ServeHTTP(0xe43400?, {0x9c4a68?, 0x2d8ef7ee41e0?}, 0x7e1176?)
        /usr/lib/go/src/net/http/server.go:2286 +0x29
net/http.(*ServeMux).ServeHTTP(0x482d39?, {0x9c4a68, 0x2d8ef7ee41e0}, 0x2d8ef7de4a00)
        /usr/lib/go/src/net/http/server.go:2828 +0x1c7
net/http.serverHandler.ServeHTTP({0x2d8ef7d748c0?}, {0x9c4a68?, 0x2d8ef7ee41e0?}, 0x6?)
        /usr/lib/go/src/net/http/server.go:3311 +0x8e
net/http.(*conn).serve(0x2d8ef7df8360, {0x9c5e48, 0x2d8ef7e1c570})
        /usr/lib/go/src/net/http/server.go:2073 +0x650
created by net/http.(*Server).Serve in goroutine 1
        /usr/lib/go/src/net/http/server.go:3464 +0x485
2026/03/27 18:47:47 read error: failed to read JSON message: failed to get reader: received close frame: status = StatusNoStatusRcvd and reason = ""
2026/03/27 18:47:47 http: panic serving 127.0.0.1:54648: runtime error: invalid memory address or nil pointer dereference
goroutine 53 [running]:
net/http.(*conn).serve.func1()
        /usr/lib/go/src/net/http/server.go:1907 +0xbd
panic({0x8e0f20?, 0xe2b190?})
        /usr/lib/go/src/runtime/panic.go:860 +0x13a
github.com/coder/websocket.(*Conn).casClosing(...)
        /home/ffus/go/pkg/mod/github.com/coder/websocket@v1.8.14/close.go:325
github.com/coder/websocket.(*Conn).CloseNow(0x2d8e00000001?)
        /home/ffus/go/pkg/mod/github.com/coder/websocket@v1.8.14/close.go:135 +0x48
main.closeConnection(0x2d8ef7f61990?, 0xb8?)
        /home/ffus/Projects/go-socket/wsServer.go:183 +0x2d
main.ServeWsConnection({0x9c4a68?, 0x2d8ef7f2c1e0?}, 0x2d8ef7f56b30?)
        /home/ffus/Projects/go-socket/wsServer.go:36 +0x350
net/http.HandlerFunc.ServeHTTP(0xe43400?, {0x9c4a68?, 0x2d8ef7f2c1e0?}, 0x7e1176?)
        /usr/lib/go/src/net/http/server.go:2286 +0x29
net/http.(*ServeMux).ServeHTTP(0x482d39?, {0x9c4a68, 0x2d8ef7f2c1e0}, 0x2d8ef7f26140)
        /usr/lib/go/src/net/http/server.go:2828 +0x1c7
net/http.serverHandler.ServeHTTP({0x2d8ef7f38080?}, {0x9c4a68?, 0x2d8ef7f2c1e0?}, 0x6?)
        /usr/lib/go/src/net/http/server.go:3311 +0x8e
net/http.(*conn).serve(0x2d8ef7f2a2d0, {0x9c5e48, 0x2d8ef7e1c570})
        /usr/lib/go/src/net/http/server.go:2073 +0x650
created by net/http.(*Server).Serve in goroutine 1
        /usr/lib/go/src/net/http/server.go:3464 +0x485