diff --git a/ffmpeg/ffmpeg.go b/ffmpeg/ffmpeg.go
index 26790b1..f05119e 100644
--- a/ffmpeg/ffmpeg.go
+++ b/ffmpeg/ffmpeg.go
@@ -85,6 +85,9 @@ func LoadAVContext(ctx context.Context, reader io.Reader, size int64) (*AVContex
 }
 
 func (av *AVContext) ProcessFrames(maxFrames int) (err error) {
+	if av.formatContext == nil || av.codecContext == nil {
+		return ErrDecoderNotFound
+	}
 	if av.thumbContext == nil {
 		return createThumbContext(av, C.int(maxFrames))
 	}
diff --git a/processor_test.go b/processor_test.go
index e088d74..32adde3 100644
--- a/processor_test.go
+++ b/processor_test.go
@@ -55,6 +55,8 @@ func TestProcessor(t *testing.T) {
 		{name: "image", path: "fit-in/100x100/demo.png"},
 		{name: "alpha", path: "fit-in/filters:format(png)/alpha-webm.webm"},
 		{name: "corrupted", path: "fit-in/100x100/corrupt/everybody-betray-me.mkv", expectCode: 406},
+		{name: "no cover meta", path: "meta/no_cover.mp3"},
+		{name: "no cover 406", path: "fit-in/100x100/no_cover.mp3", expectCode: 406},
 	}, WithDebug(true), WithLogger(zap.NewExample()))
 	doGoldenTests(t, filepath.Join(testDataDir, "golden/result-fallback-image"), []test{
 		{name: "corrupted with fallback image", path: "fit-in/100x100/corrupt/everybody-betray-me.mkv", expectCode: 406},
diff --git a/testdata/golden/result/fit-in/100x100/no_cover.mp3 b/testdata/golden/result/fit-in/100x100/no_cover.mp3
new file mode 100644
index 0000000..5bfd67a
Binary files /dev/null and b/testdata/golden/result/fit-in/100x100/no_cover.mp3 differ
diff --git a/testdata/golden/result/meta/no_cover.mp3 b/testdata/golden/result/meta/no_cover.mp3
new file mode 100644
index 0000000..6f0994b
--- /dev/null
+++ b/testdata/golden/result/meta/no_cover.mp3
@@ -0,0 +1 @@
+{"format":"mp3","content_type":"audio/mpeg","orientation":0,"duration":13536,"has_video":false,"has_audio":true}
\ No newline at end of file
diff --git a/testdata/no_cover.mp3 b/testdata/no_cover.mp3
new file mode 100644
index 0000000..9c6f3d9
Binary files /dev/null and b/testdata/no_cover.mp3 differ