X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/74353374c38237d1c976dabf81703dd885d0d556..fc31973daffea3506051ce51a5f79383ce0867d6:/LUFA/Drivers/USB/Class/Host/StillImage.c?ds=sidebyside

diff --git a/LUFA/Drivers/USB/Class/Host/StillImage.c b/LUFA/Drivers/USB/Class/Host/StillImage.c
index d116ceb74..50be7d6d2 100644
--- a/LUFA/Drivers/USB/Class/Host/StillImage.c
+++ b/LUFA/Drivers/USB/Class/Host/StillImage.c
@@ -151,7 +151,8 @@ uint8_t SImage_Host_SendBlockHeader(USB_ClassInfo_SI_Host_t* const SIInterfaceIn
 	if ((USB_HostState != HOST_STATE_Configured) || !(SIInterfaceInfo->State.IsActive))
 	  return PIPE_RWSTREAM_DeviceDisconnected;
 
-	PIMAHeader->TransactionID = SIInterfaceInfo->State.TransactionID++;
+	if (SIInterfaceInfo->State.IsSessionOpen)
+	  PIMAHeader->TransactionID = SIInterfaceInfo->State.TransactionID++;
 
 	Pipe_SelectPipe(SIInterfaceInfo->Config.DataOUTPipeNumber);
 	Pipe_Unfreeze();