diff --git a/WHATS_NEW_DM b/WHATS_NEW_DM
index 5c7906609..6072bd030 100644
--- a/WHATS_NEW_DM
+++ b/WHATS_NEW_DM
@@ -1,5 +1,6 @@
 Version 1.02.64 - 
 ===================================
+  Improve stack debug reporting in dm_task_create().
   Fallback to control node creation only if node doesn't exist yet.
   Change dm_hash API for binary data to accept const void *key.
   Fix memory access of empty params string in _reload_with_suppression_v4().
diff --git a/libdm/ioctl/libdm-iface.c b/libdm/ioctl/libdm-iface.c
index b52c9254b..bf07a44eb 100644
--- a/libdm/ioctl/libdm-iface.c
+++ b/libdm/ioctl/libdm-iface.c
@@ -965,8 +965,10 @@ int dm_check_version(void)
 	if (_check_version(dmversion, sizeof(dmversion), _dm_compat))
 		return 1;
 
-	if (!_dm_compat)
+	if (!_dm_compat) {
+		log_error("Support for older device-mapped version is disabled.");
 		goto bad;
+	}
 
 	log_verbose("device-mapper ioctl protocol version %u failed. "
 		    "Trying protocol version 1.", _dm_version);
diff --git a/libdm/libdm-common.c b/libdm/libdm-common.c
index 56b913765..c5780e7c6 100644
--- a/libdm/libdm-common.c
+++ b/libdm/libdm-common.c
@@ -183,7 +183,7 @@ struct dm_task *dm_task_create(int type)
 
 	if (!dm_check_version()) {
 		dm_free(dmt);
-		return NULL;
+		return_NULL;
 	}
 
 	dmt->type = type;