diff --git a/src/audio.cpp b/src/audio.cpp
index 34fbc40..3aa69bd 100644
--- a/src/audio.cpp
+++ b/src/audio.cpp
@@ -1071,7 +1071,8 @@ private:
 					ALint size = AL::Buffer::getSize(buf);
 					ALint chan = AL::Buffer::getChannels(buf);
 
-					procFrames += ((size / (bits / 8)) / chan);
+					if (bits != 0 && chan != 0)
+						procFrames += ((size / (bits / 8)) / chan);
 				}
 
 				if (sourceExhausted)