diff --git a/spa/plugins/alsa/alsa-seq.c b/spa/plugins/alsa/alsa-seq.c
index ec669045f..f5065999e 100644
--- a/spa/plugins/alsa/alsa-seq.c
+++ b/spa/plugins/alsa/alsa-seq.c
@@ -679,7 +679,7 @@ static int update_time(struct seq_state *state, uint64_t nsec, bool follower)
 {
 	snd_seq_queue_status_t *status;
 	const snd_seq_real_time_t* queue_time;
-	uint64_t queue_real;
+	uint64_t queue_real, position;
 	double err, corr;
 	uint64_t clock_elapsed, queue_elapsed;
 
@@ -688,6 +688,9 @@ static int update_time(struct seq_state *state, uint64_t nsec, bool follower)
 		state->rate = clock->rate;
 		state->duration = clock->duration;
 		state->threshold = state->duration;
+		position = clock->position;
+	} else {
+		position = 0;
 	}
 
 	/* take queue time */
@@ -698,12 +701,12 @@ static int update_time(struct seq_state *state, uint64_t nsec, bool follower)
 
 	if (state->queue_base == 0) {
 		state->queue_base = nsec - queue_real;
-		state->clock_base = state->position->clock.position;
+		state->clock_base = position;
 	}
 
 	corr = 1.0 - (state->z2 + state->z3);
 
-	clock_elapsed = state->position->clock.position - state->clock_base;
+	clock_elapsed = position - state->clock_base;
 	state->queue_time = nsec - state->queue_base;
 	queue_elapsed = NSEC_TO_CLOCK(state->clock, state->queue_time) / corr;
 
@@ -754,7 +757,7 @@ int spa_alsa_seq_process(struct seq_state *state)
 
 	res = process_recycle(state);
 
-	if (state->following) {
+	if (state->following && state->position) {
 		update_time(state, state->position->clock.nsec, true);
 		res |= process_read(state);
 	}
diff --git a/src/examples/media-session/policy-ep.c b/src/examples/media-session/policy-ep.c
index dbb9bd782..76d4f3948 100644
--- a/src/examples/media-session/policy-ep.c
+++ b/src/examples/media-session/policy-ep.c
@@ -430,8 +430,8 @@ static int rescan_endpoint(struct impl *impl, struct endpoint *ep)
 
 		if ((obj = sm_media_session_find_object(impl->session, path_id)) != NULL) {
 			if (strcmp(obj->type, PW_TYPE_INTERFACE_Endpoint) == 0) {
-				peer = sm_object_get_data(obj, SESSION_KEY);
-				goto do_link;
+				if ((peer = sm_object_get_data(obj, SESSION_KEY)) != NULL)
+					goto do_link;
 			}
 			else if (strcmp(obj->type, PW_TYPE_INTERFACE_Node) == 0) {
 				node = (struct sm_node*)obj;
diff --git a/src/examples/media-session/stream-endpoint.c b/src/examples/media-session/stream-endpoint.c
index 1196d473f..7d9147dcd 100644
--- a/src/examples/media-session/stream-endpoint.c
+++ b/src/examples/media-session/stream-endpoint.c
@@ -490,7 +490,8 @@ static void object_update(void *data)
 	    node->obj->obj.avail & SM_OBJECT_CHANGE_MASK_PROPERTIES)
 		node->endpoint = create_endpoint(node);
 
-	if (node->obj->obj.changed & SM_NODE_CHANGE_MASK_PARAMS)
+	if (node->endpoint &&
+	    node->obj->obj.changed & SM_NODE_CHANGE_MASK_PARAMS)
 		update_params(node->endpoint);
 }
 
diff --git a/src/gst/gstpipewiredeviceprovider.c b/src/gst/gstpipewiredeviceprovider.c
index a4a6b50a2..e0b8d8550 100644
--- a/src/gst/gstpipewiredeviceprovider.c
+++ b/src/gst/gstpipewiredeviceprovider.c
@@ -239,11 +239,10 @@ new_node (GstPipeWireDeviceProvider *self, struct node_data *data)
       gst_structure_set (props, item->key, G_TYPE_STRING, item->value, NULL);
 
     klass = spa_dict_lookup (info->props, PW_KEY_MEDIA_CLASS);
+    name = spa_dict_lookup (info->props, PW_KEY_NODE_DESCRIPTION);
   }
   if (klass == NULL)
     klass = "unknown/unknown";
-
-  name = spa_dict_lookup (info->props, PW_KEY_NODE_DESCRIPTION);
   if (name == NULL)
     name = "unknown";
 
diff --git a/src/modules/module-protocol-native/v0/protocol-native.c b/src/modules/module-protocol-native/v0/protocol-native.c
index 6d560e10c..76b8f450d 100644
--- a/src/modules/module-protocol-native/v0/protocol-native.c
+++ b/src/modules/module-protocol-native/v0/protocol-native.c
@@ -806,17 +806,19 @@ static void registry_marshal_global(void *object, uint32_t id, uint32_t permissi
 	n_items = props ? props->n_items : 0;
 
 	parent_id = 0;
-	if (strcmp(type, PW_TYPE_INTERFACE_Port) == 0) {
-		if ((str = spa_dict_lookup(props, "node.id")) != NULL)
-			parent_id = atoi(str);
-	} else if (strcmp(type, PW_TYPE_INTERFACE_Node) == 0) {
-		if ((str = spa_dict_lookup(props, "device.id")) != NULL)
-			parent_id = atoi(str);
-	} else if (strcmp(type, PW_TYPE_INTERFACE_Client) == 0 ||
-	    strcmp(type, PW_TYPE_INTERFACE_Device) == 0 ||
-	    strcmp(type, PW_TYPE_INTERFACE_Factory) == 0) {
-		if ((str = spa_dict_lookup(props, "module.id")) != NULL)
-			parent_id = atoi(str);
+	if (props) {
+		if (strcmp(type, PW_TYPE_INTERFACE_Port) == 0) {
+			if ((str = spa_dict_lookup(props, "node.id")) != NULL)
+				parent_id = atoi(str);
+		} else if (strcmp(type, PW_TYPE_INTERFACE_Node) == 0) {
+			if ((str = spa_dict_lookup(props, "device.id")) != NULL)
+				parent_id = atoi(str);
+		} else if (strcmp(type, PW_TYPE_INTERFACE_Client) == 0 ||
+		    strcmp(type, PW_TYPE_INTERFACE_Device) == 0 ||
+		    strcmp(type, PW_TYPE_INTERFACE_Factory) == 0) {
+			if ((str = spa_dict_lookup(props, "module.id")) != NULL)
+				parent_id = atoi(str);
+		}
 	}
 
 	version = 0;