diff --git a/spa/plugins/bluez5/a2dp-sink.c b/spa/plugins/bluez5/a2dp-sink.c
index 7efe8de41..16a184754 100644
--- a/spa/plugins/bluez5/a2dp-sink.c
+++ b/spa/plugins/bluez5/a2dp-sink.c
@@ -923,6 +923,8 @@ impl_node_port_enum_params(void *object, int seq,
 	case SPA_PARAM_EnumFormat:
 		if (this->codec == NULL)
 			return -EIO;
+		if (this->transport == NULL)
+			return -EIO;
 
 		if ((res = this->codec->enum_config(this->codec,
 					this->transport->configuration,
diff --git a/spa/plugins/bluez5/a2dp-source.c b/spa/plugins/bluez5/a2dp-source.c
index 471fd96cd..84a8a5e9f 100644
--- a/spa/plugins/bluez5/a2dp-source.c
+++ b/spa/plugins/bluez5/a2dp-source.c
@@ -757,6 +757,8 @@ impl_node_port_enum_params(void *object, int seq,
 			return 0;
 		if (this->codec == NULL)
 			return -EIO;
+		if (this->transport == NULL)
+			return -EIO;
 
 		if ((res = this->codec->enum_config(this->codec,
 					this->transport->configuration,