From 879b9c99310e45faeb7a00a5fade4acf40a28a54 Mon Sep 17 00:00:00 2001
From: Leland Lucius <github@homerow.net>
Date: Mon, 27 Apr 2015 20:17:13 -0500
Subject: [PATCH] Fix for bug #922.

---
 src/effects/VST/VSTEffect.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/effects/VST/VSTEffect.cpp b/src/effects/VST/VSTEffect.cpp
index 460849869..4e92e8bf8 100644
--- a/src/effects/VST/VSTEffect.cpp
+++ b/src/effects/VST/VSTEffect.cpp
@@ -1839,11 +1839,15 @@ bool VSTEffect::ProcessFinalize()
 
 sampleCount VSTEffect::ProcessBlock(float **inBlock, float **outBlock, sampleCount blockLen)
 {
-   // Go let the plugin moleste the samples
-   callProcessReplacing(inBlock, outBlock, blockLen);
+   // Only call the effect if there's something to do...some do not like zero-length block
+   if (blockLen)
+   {
+      // Go let the plugin moleste the samples
+      callProcessReplacing(inBlock, outBlock, blockLen);
 
-   // And track the position
-   mTimeInfo.samplePos += ((double) blockLen / mTimeInfo.sampleRate);
+      // And track the position
+      mTimeInfo.samplePos += ((double) blockLen / mTimeInfo.sampleRate);
+   }
 
    return blockLen;
 }