diff --git a/src/sound/s_sndseq.cpp b/src/sound/s_sndseq.cpp
index 80c1eda58..21e8fc236 100644
--- a/src/sound/s_sndseq.cpp
+++ b/src/sound/s_sndseq.cpp
@@ -151,7 +151,7 @@ public:
 	}
 	bool IsPlaying()
 	{
-		return S_GetSoundPlayingInfo (m_Poly, m_CurrentSoundID);
+		return m_CurrentSoundID != 0 && S_GetSoundPlayingInfo (m_Poly, m_CurrentSoundID);
 	}
 	void *Source()
 	{
@@ -180,7 +180,7 @@ public:
 	}
 	bool IsPlaying()
 	{
-		return S_GetSoundPlayingInfo (m_Sector, m_CurrentSoundID);
+		return m_CurrentSoundID != 0 && S_GetSoundPlayingInfo (m_Sector, m_CurrentSoundID);
 	}
 	void *Source()
 	{