diff --git a/[refs] b/[refs]
index a0ebba1281d9..15c839894527 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4793d15b25821003486bb11b54eaf2f3130ecacd
+refs/heads/master: 7d31acda9f8eaa27e2fd232712f7e1f3e9a79bdb
diff --git a/trunk/drivers/isdn/capi/capiutil.c b/trunk/drivers/isdn/capi/capiutil.c
index c7c29022a23a..16f2e465e5f9 100644
--- a/trunk/drivers/isdn/capi/capiutil.c
+++ b/trunk/drivers/isdn/capi/capiutil.c
@@ -989,6 +989,8 @@ _cdebbuf *capi_cmsg2str(_cmsg * cmsg)
 {
 	_cdebbuf *cdb;
 
+	if (!cmsg->m)
+		return NULL;	/* no message */
 	cdb = cdebbuf_alloc();
 	if (!cdb)
 		return NULL;