diff --git a/src/common/pa_process.c b/src/common/pa_process.c
index 01a9ee2..3830532 100644
--- a/src/common/pa_process.c
+++ b/src/common/pa_process.c
@@ -764,7 +764,7 @@ static unsigned long NonAdaptingProcess( PaUtilBufferProcessor *bp,
                     destChannelStrideBytes = bp->bytesPerUserInputSample;
 
                     /* process host buffer directly, or use temp buffer if formats differ or host buffer non-interleaved */
-                    if( bp->userInputSampleFormatIsEqualToHost && bp->hostInputIsInterleaved )
+                    if( bp->userInputSampleFormatIsEqualToHost && bp->hostInputIsInterleaved && bp->hostInputChannels[0][0].data)
                     {
                         userInput = hostInputChannels[0].data;
                         destBytePtr = (unsigned char *)hostInputChannels[0].data;
@@ -781,7 +781,7 @@ static unsigned long NonAdaptingProcess( PaUtilBufferProcessor *bp,
                     destChannelStrideBytes = frameCount * bp->bytesPerUserInputSample;
 
                     /* setup non-interleaved ptrs */
-                    if( bp->userInputSampleFormatIsEqualToHost && !bp->hostInputIsInterleaved )
+                    if( bp->userInputSampleFormatIsEqualToHost && !bp->hostInputIsInterleaved && bp->hostInputChannels[0][0].data )
                     {
                         for( i=0; i<bp->inputChannelCount; ++i )
                         {