diff --git a/engine/client/snd_dma.c b/engine/client/snd_dma.c
index 65a8b52ff..5cd10f2c9 100644
--- a/engine/client/snd_dma.c
+++ b/engine/client/snd_dma.c
@@ -3143,7 +3143,10 @@ float S_GetChannelLevel(int entnum, int entchannel)
 			if (sc->channel[i].entnum == entnum && sc->channel[i].entchannel == entchannel && sc->channel[i].sfx)
 			{
 				ssamplepos_t spos = sc->GetChannelPos?sc->GetChannelPos(sc, &sc->channel[i]):(sc->channel[i].pos>>PITCHSHIFT);
-				scache = sc->channel[i].sfx->decoder.decodedata(sc->channel[i].sfx, &scachebuf, spos, 1);
+				if (sc->channel[i].sfx->decoder.decodedata)scache = sc->channel[i].sfx->decoder.decodedata(sc->channel[i].sfx, &scachebuf, spos, 1);
+				else 
+					scache = NULL;
+
 				if (!scache)
 					scache = sc->channel[i].sfx->decoder.buf;
 				if (scache && spos >= scache->soundoffset && spos < scache->soundoffset+scache->length)