fix crash when midi scale is not set

diff --git a/jack_mixer.c b/jack_mixer.c
index a8703a3a95325e9780697a60d6bee6e0e77a9fce..7b0a8c4889a266d05994da144c0b9c82d1ea682b 100644 (file)
--- a/jack_mixer.c
+++ b/jack_mixer.c
@@ -949,7 +949,7 @@ process(
     for (cc_channel_index=0; cc_channel_index<128; cc_channel_index++)
     {
       channel_ptr = mixer_ptr->midi_cc_map[cc_channel_index];
-      if (channel_ptr == NULL)
+      if (channel_ptr == NULL || channel_ptr->midi_scale == NULL)
       {
         continue;
       }