Do not crash if adding a channel fails

diff --git a/jack_mixer_c.c b/jack_mixer_c.c
index 3990b6ac76a84348182016f08e294830ef4c0a44..dc4c9e820b22a91cf454df0cdc7a9505667c65fa 100644 (file)
--- a/jack_mixer_c.c
+++ b/jack_mixer_c.c
@@ -756,6 +756,11 @@ Mixer_add_channel(MixerObject *self, PyObject *args)
 
        channel = add_channel(self->mixer, name, (bool)stereo);
 
+       if (channel == NULL) {
+               PyErr_SetString(PyExc_RuntimeError, "error adding channel");
+               return NULL;
+       }
+
        return Channel_New(channel);
 }