Avoid potential division by zero.

diff --git a/libs/ardour/export_graph_builder.cc b/libs/ardour/export_graph_builder.cc
index 2c0c44033d1bab3cf50dc542fb18836e3ae61860..5e8c052b637dbaf804dae5e876de058c4d263a9d 100644 (file)
--- a/libs/ardour/export_graph_builder.cc
+++ b/libs/ardour/export_graph_builder.cc
@@ -514,7 +514,9 @@ ExportGraphBuilder::ChannelConfig::ChannelConfig (ExportGraphBuilder & parent, F
        // Make the chunk size divisible by the channel count
        int chan_count = new_config.channel_config->get_n_chans();
        max_frames_out = 8192;
-       max_frames_out -= max_frames_out % chan_count;
+       if (chan_count > 0) {
+               max_frames_out -= max_frames_out % chan_count;
+       }
        chunker.reset (new Chunker<Sample> (max_frames_out));
        interleaver->add_output(chunker);