diff --git a/pkg/config/loader.go b/pkg/config/loader.go
index 99ae6e7c..a2fb6bd8 100644
--- a/pkg/config/loader.go
+++ b/pkg/config/loader.go
@@ -88,6 +88,9 @@ func (e *Env) Read() (Kv, error) {
 	mp := make(Kv)
 	for _, k := range keys {
 		parts := strings.SplitN(k, "=", 2)
+		if parts == nil {
+			continue
+		}
 		n := strings.ToLower(strings.TrimPrefix(parts[0], string(*e)))
 		if n == "" {
 			continue
@@ -102,7 +105,9 @@ func (e *Env) Read() (Kv, error) {
 		} else {
 			key = strings.Replace(n[:x+1], "_", ".", -1) + n[x+2:]
 		}
-		mp[key] = parts[1]
+		if len(parts) > 1 {
+			mp[key] = parts[1]
+		}
 	}
 	return maps.Unflatten(mp, "."), nil
 }
diff --git a/pkg/coordinator/userhandlers.go b/pkg/coordinator/userhandlers.go
index 81b6bf4f..d754109d 100644
--- a/pkg/coordinator/userhandlers.go
+++ b/pkg/coordinator/userhandlers.go
@@ -127,14 +127,16 @@ func (u *User) handleGetWorkerList(debug bool, info HasServerInfo) {
 	if debug {
 		response.Servers = servers
 	} else {
-		// not sure if []byte to string always reversible :/
 		unique := map[string]*api.Server{}
 		for _, s := range servers {
 			mid := s.Machine
 			if _, ok := unique[mid]; !ok {
 				unique[mid] = &api.Server{Addr: s.Addr, PingURL: s.PingURL, Id: s.Id, InGroup: true}
 			}
-			unique[mid].Replicas++
+			v := unique[mid]
+			if v != nil {
+				v.Replicas++
+			}
 		}
 		for _, v := range unique {
 			response.Servers = append(response.Servers, *v)
diff --git a/pkg/encoder/encoder.go b/pkg/encoder/encoder.go
index a9f9003c..5378e47c 100644
--- a/pkg/encoder/encoder.go
+++ b/pkg/encoder/encoder.go
@@ -62,6 +62,9 @@ func NewVideoEncoder(w, h, dw, dh int, scale float64, conf config.Video, log *lo
 	if err != nil {
 		return nil, err
 	}
+	if enc == nil {
+		return nil, fmt.Errorf("no encoder")
+	}
 
 	return &Video{codec: enc, y: yuv.NewYuvConv(w, h, scale), log: log}, nil
 }
@@ -86,6 +89,10 @@ func (v *Video) Info() string {
 }
 
 func (v *Video) SetPixFormat(f uint32) {
+	if v == nil {
+		return
+	}
+
 	switch f {
 	case 1:
 		v.pf = yuv.PixFmt(yuv.FourccArgb)
@@ -98,15 +105,28 @@ func (v *Video) SetPixFormat(f uint32) {
 
 // SetRot sets the de-rotation angle of the frames.
 func (v *Video) SetRot(a uint) {
+	if v == nil {
+		return
+	}
+
 	if a > 0 {
 		v.rot = (a + 180) % 360
 	}
 }
 
 // SetFlip tells the encoder to flip the frames vertically.
-func (v *Video) SetFlip(b bool) { v.codec.SetFlip(b) }
+func (v *Video) SetFlip(b bool) {
+	if v == nil {
+		return
+	}
+	v.codec.SetFlip(b)
+}
 
 func (v *Video) Stop() {
+	if v == nil {
+		return
+	}
+
 	if v.stopped.Swap(true) {
 		return
 	}
@@ -114,6 +134,8 @@ func (v *Video) Stop() {
 
 	defer func() { v.codec = nil }()
 	if err := v.codec.Shutdown(); err != nil {
-		v.log.Error().Err(err).Msg("failed to close the encoder")
+		if v.log != nil {
+			v.log.Error().Err(err).Msg("failed to close the encoder")
+		}
 	}
 }
diff --git a/pkg/encoder/h264/x264_test.go b/pkg/encoder/h264/x264_test.go
index b13c0bc4..09f22ae3 100644
--- a/pkg/encoder/h264/x264_test.go
+++ b/pkg/encoder/h264/x264_test.go
@@ -6,6 +6,7 @@ func TestH264Encode(t *testing.T) {
 	h264, err := NewEncoder(120, 120, 0, nil)
 	if err != nil {
 		t.Error(err)
+		return
 	}
 	data := make([]byte, 120*120*1.5)
 	h264.LoadBuf(data)
@@ -20,6 +21,7 @@ func Benchmark(b *testing.B) {
 	h264, err := NewEncoder(w, h, 0, nil)
 	if err != nil {
 		b.Error(err)
+		return
 	}
 	data := make([]byte, int(float64(w)*float64(h)*1.5))
 	for i := 0; i < b.N; i++ {
diff --git a/pkg/network/address.go b/pkg/network/address.go
index 5fcaca49..318c9cd5 100644
--- a/pkg/network/address.go
+++ b/pkg/network/address.go
@@ -2,6 +2,7 @@ package network
 
 import (
 	"errors"
+	"net"
 	"strconv"
 	"strings"
 )
@@ -12,15 +13,17 @@ func (a *Address) Port() (int, error) {
 	if len(string(*a)) == 0 {
 		return 0, errors.New("no address")
 	}
-	parts := strings.Split(string(*a), ":")
-	var port string
-	if len(parts) == 1 {
-		port = parts[0]
-	} else {
-		port = parts[len(parts)-1]
+	addr := replaceAllExceptLast(string(*a), ":", "_")
+	_, port, err := net.SplitHostPort(addr)
+	if err != nil {
+		return 0, err
 	}
 	if val, err := strconv.Atoi(port); err == nil {
 		return val, nil
 	}
 	return 0, errors.New("port is not a number")
 }
+
+func replaceAllExceptLast(s, c, x string) string {
+	return strings.Replace(s, c, x, strings.Count(s, c)-1)
+}
diff --git a/pkg/network/httpx/server.go b/pkg/network/httpx/server.go
index eb6e8c1e..5486c05c 100644
--- a/pkg/network/httpx/server.go
+++ b/pkg/network/httpx/server.go
@@ -120,12 +120,12 @@ func (s *Server) run() {
 	s.log.Debug().Msgf("Starting %s server on %s", protocol, s.Addr)
 
 	if s.opts.Https && s.opts.HttpsRedirect {
-		rdr, err := s.redirection()
-		if err != nil {
+		if rdr, err := s.redirection(); err == nil {
+			s.redirect = rdr
+			go s.redirect.Run()
+		} else {
 			s.log.Error().Err(err).Msg("couldn't init redirection server")
 		}
-		s.redirect = rdr
-		go s.redirect.Run()
 	}
 
 	var err error
@@ -165,6 +165,7 @@ func (s *Server) redirection() (*Server, error) {
 		address = s.opts.HttpsDomain
 	}
 	addr := buildAddress(address, s.opts.Zone, *s.listener)
+	s.log.Info().Str("addr", addr).Msg("Start HTTPS redirect server")
 
 	srv, err := NewServer(s.opts.HttpsRedirectAddress, func(serv *Server) Handler {
 		h := NewServeMux("")
@@ -186,7 +187,6 @@ func (s *Server) redirection() (*Server, error) {
 	},
 		WithLogger(s.log),
 	)
-	s.log.Info().Str("addr", addr).Msg("Start HTTPS redirect server")
 	return srv, err
 }
 
diff --git a/pkg/worker/caged/libretro/caged.go b/pkg/worker/caged/libretro/caged.go
index a0b5f633..dea9bf5c 100644
--- a/pkg/worker/caged/libretro/caged.go
+++ b/pkg/worker/caged/libretro/caged.go
@@ -38,6 +38,7 @@ func (c *Caged) ReloadFrontend() {
 	frontend, err := NewFrontend(c.conf.Emulator, c.log)
 	if err != nil {
 		c.log.Fatal().Err(err).Send()
+		return
 	}
 	c.Emulator = frontend
 	c.base = frontend
@@ -47,6 +48,9 @@ func (c *Caged) ReloadFrontend() {
 func (c *Caged) VideoChangeCb(fn func()) { c.base.SetVideoChangeCb(fn) }
 
 func (c *Caged) Load(game games.GameMetadata, path string) error {
+	if c.Emulator == nil {
+		return nil
+	}
 	c.Emulator.LoadCore(game.System)
 	if err := c.Emulator.LoadGame(game.FullPath(path)); err != nil {
 		return err
diff --git a/pkg/worker/caged/libretro/frontend.go b/pkg/worker/caged/libretro/frontend.go
index dc8316d5..0386b0a8 100644
--- a/pkg/worker/caged/libretro/frontend.go
+++ b/pkg/worker/caged/libretro/frontend.go
@@ -217,6 +217,9 @@ func (f *Frontend) Shutdown() {
 
 func (f *Frontend) linkNano(nano *nanoarch.Nanoarch) {
 	f.nano = nano
+	if nano == nil {
+		return
+	}
 	f.nano.WaitReady() // start only when nano is available
 
 	f.nano.OnKeyPress = f.input.isKeyPressed
@@ -225,7 +228,11 @@ func (f *Frontend) linkNano(nano *nanoarch.Nanoarch) {
 	f.nano.OnAudio = f.handleAudio
 }
 
-func (f *Frontend) SetVideoChangeCb(fn func()) { f.nano.OnSystemAvInfo = fn }
+func (f *Frontend) SetVideoChangeCb(fn func()) {
+	if f.nano != nil {
+		f.nano.OnSystemAvInfo = fn
+	}
+}
 
 func (f *Frontend) Start() {
 	f.log.Debug().Msgf("frontend start")
diff --git a/pkg/worker/caged/libretro/graphics/opengl.go b/pkg/worker/caged/libretro/graphics/opengl.go
index ea8b8c09..99eef10d 100644
--- a/pkg/worker/caged/libretro/graphics/opengl.go
+++ b/pkg/worker/caged/libretro/graphics/opengl.go
@@ -50,7 +50,7 @@ const (
 
 var (
 	opt = offscreenSetup{}
-	buf []byte
+	buf = make([]byte, 1024*1024)
 )
 
 func initContext(getProcAddr func(name string) unsafe.Pointer) {
diff --git a/pkg/worker/caged/libretro/manager/grab.go b/pkg/worker/caged/libretro/manager/grab.go
index a2ece967..f7d40a05 100644
--- a/pkg/worker/caged/libretro/manager/grab.go
+++ b/pkg/worker/caged/libretro/manager/grab.go
@@ -47,11 +47,15 @@ func (d GrabDownloader) Request(dest string, urls ...Download) (ok []string, noo
 		r := resp.Request
 		if err := resp.Err(); err != nil {
 			d.log.Error().Err(err).Msgf("download [%s] %s has failed: %v", r.Label, r.URL(), err)
-			if resp.HTTPResponse.StatusCode == 404 {
+			if resp.HTTPResponse != nil && resp.HTTPResponse.StatusCode == 404 {
 				nook = append(nook, resp.Request.Label)
 			}
 		} else {
-			d.log.Info().Msgf("Downloaded [%v] [%s] -> %s", resp.HTTPResponse.Status, r.Label, resp.Filename)
+			status := ""
+			if resp.HTTPResponse != nil {
+				status = resp.HTTPResponse.Status
+			}
+			d.log.Info().Msgf("Downloaded [%v] [%s] -> %s", status, r.Label, resp.Filename)
 			ok = append(ok, resp.Filename)
 		}
 	}
diff --git a/pkg/worker/media/media.go b/pkg/worker/media/media.go
index 70758b1c..39c48442 100644
--- a/pkg/worker/media/media.go
+++ b/pkg/worker/media/media.go
@@ -145,6 +145,10 @@ func (wmp *WebrtcMediaPipe) Init() error {
 	if err := wmp.initVideo(wmp.VideoW, wmp.VideoH, wmp.VideoScale, wmp.vConf); err != nil {
 		return err
 	}
+	if wmp.v == nil || wmp.a == nil {
+		return fmt.Errorf("could intit the encoders, v=%v a=%v", wmp.v != nil, wmp.a != nil)
+	}
+
 	wmp.log.Debug().Msgf("%v", wmp.v.Info())
 	wmp.initialized = true
 	return nil
@@ -179,7 +183,14 @@ func (wmp *WebrtcMediaPipe) encodeAudio(pcm samples) {
 
 func (wmp *WebrtcMediaPipe) initVideo(w, h int, scale float64, conf config.Video) (err error) {
 	sw, sh := round(w, scale), round(h, scale)
-	wmp.v, err = encoder.NewVideoEncoder(w, h, sw, sh, scale, conf, wmp.log)
+	enc, err := encoder.NewVideoEncoder(w, h, sw, sh, scale, conf, wmp.log)
+	if err != nil {
+		return err
+	}
+	if enc == nil {
+		return fmt.Errorf("broken video encoder init")
+	}
+	wmp.v = enc
 	wmp.log.Debug().Msgf("media scale: %vx%v -> %vx%v", w, h, sw, sh)
 	return err
 }
diff --git a/pkg/worker/media/media_test.go b/pkg/worker/media/media_test.go
index 93568cc2..8db75e6c 100644
--- a/pkg/worker/media/media_test.go
+++ b/pkg/worker/media/media_test.go
@@ -66,6 +66,7 @@ func run(w, h int, cod encoder.VideoCodec, count int, a *image.RGBA, b *image.RG
 	ve, err := encoder.NewVideoEncoder(w, h, w, h, 1, conf, l)
 	if err != nil {
 		backend.Error(err)
+		return
 	}
 	defer ve.Stop()
 
diff --git a/pkg/worker/recorder/recorder.go b/pkg/worker/recorder/recorder.go
index 4c3d1207..d0c1165b 100644
--- a/pkg/worker/recorder/recorder.go
+++ b/pkg/worker/recorder/recorder.go
@@ -98,11 +98,13 @@ func (r *Recording) Start() {
 	audio, err := newWavStream(path, r.opts)
 	if err != nil {
 		r.log.Fatal().Err(err)
+		return
 	}
 	r.audio = audio
 	video, err := newRawStream(path)
 	if err != nil {
 		r.log.Fatal().Err(err)
+		return
 	}
 	r.video = video
 }
@@ -111,8 +113,12 @@ func (r *Recording) Stop() (err error) {
 	r.Lock()
 	defer r.Unlock()
 	r.enabled = false
-	err = r.audio.Close()
-	err = r.video.Close()
+	if r.audio != nil {
+		err = r.audio.Close()
+	}
+	if r.video != nil {
+		err = r.video.Close()
+	}
 
 	path := filepath.Join(r.dir, r.saveDir)
 	// FFMPEG
diff --git a/pkg/worker/room/room_test.go b/pkg/worker/room/room_test.go
index e41004b9..c1459e0a 100644
--- a/pkg/worker/room/room_test.go
+++ b/pkg/worker/room/room_test.go
@@ -139,18 +139,15 @@ func TestAll(t *testing.T) {
 		if renderFrames {
 			rect := image.Rect(0, 0, frame.W, frame.H)
 			var src image.Image
-			if test.color == 1 {
-				src1 := bgra.NewBGRA(rect)
-				src1.Pix = frame.Data
-				src1.Stride = frame.Stride
-				src = src1
-			} else {
-				if test.color == 2 {
-					src1 := rgb565.NewRGB565(rect)
-					src1.Pix = frame.Data
-					src1.Stride = frame.Stride
-					src = src1
-				}
+			src1 := bgra.NewBGRA(rect)
+			src1.Pix = frame.Data
+			src1.Stride = frame.Stride
+			src = src1
+			if test.color == 2 {
+				src2 := rgb565.NewRGB565(rect)
+				src2.Pix = frame.Data
+				src2.Stride = frame.Stride
+				src = src2
 			}
 			dst := rgba.ToRGBA(src, flip)
 			tag := fmt.Sprintf("%v-%v-0x%08x", runtime.GOOS, test.game.Type, crc32.Checksum(frame.Data, crc32q))