diff --git a/src/modules/alsa/alsa-sink.c b/src/modules/alsa/alsa-sink.c
index 17a4b11b6..70b9230b9 100644
--- a/src/modules/alsa/alsa-sink.c
+++ b/src/modules/alsa/alsa-sink.c
@@ -2113,7 +2113,8 @@ static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char
     u->mixers = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func,
                                     NULL, (pa_free_cb_t) pa_alsa_mixer_free);
 
-    mdev = pa_proplist_gets(mapping->proplist, "alsa.mixer_device");
+    if (mapping)
+        mdev = pa_proplist_gets(mapping->proplist, "alsa.mixer_device");
     if (mdev) {
         u->mixer_handle = pa_alsa_open_mixer_by_name(u->mixers, mdev, true);
     } else {
diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c
index 76370f8fa..083f92873 100644
--- a/src/modules/alsa/alsa-source.c
+++ b/src/modules/alsa/alsa-source.c
@@ -1813,7 +1813,8 @@ static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char
     u->mixers = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func,
                                     NULL, (pa_free_cb_t) pa_alsa_mixer_free);
 
-    mdev = pa_proplist_gets(mapping->proplist, "alsa.mixer_device");
+    if (mapping)
+        mdev = pa_proplist_gets(mapping->proplist, "alsa.mixer_device");
     if (mdev) {
         u->mixer_handle = pa_alsa_open_mixer_by_name(u->mixers, mdev, false);
     } else {