diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index c8bb9df27..d964a94f5 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -3373,6 +3373,7 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
     DivDispatch* disp=disCont[i].dispatch;
     if (disp==NULL) continue;
     for (int j=0; j<disp->getOutputCount(); j++) {
+      if (disCont[i].bbOut[j]==NULL) continue;
       chipPeak[i][j]*=1.0-decay;
       float peak=chipPeak[i][j];
       for (unsigned int k=0; k<size; k++) {