diff --git a/daemon/call.c b/daemon/call.c
index 09de8665d..844077aae 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -37,7 +37,7 @@
 #define LOG_PREFIX_C "[%.*s] "
 #define LOG_PREFIX_CI "[%.*s - %.*s] "
 #define LOG_PARAMS_C(c) STR_FMT(&(c)->callid)
-#define LOG_PARAMS_CI(c) STR_FMT(&(c)->callid), STR_FMT(log_info)
+#define LOG_PARAMS_CI(c) STR_FMT(&(c)->callid), STR_FMT0(log_info)
 
 static __thread const str *log_info;
 
diff --git a/daemon/str.h b/daemon/str.h
index 2e40bcfb4..c3cee3932 100644
--- a/daemon/str.h
+++ b/daemon/str.h
@@ -21,6 +21,7 @@ typedef struct _str str;
 
 #define STR_FORMAT "%.*s"
 #define STR_FMT(str) (str)->len, (str)->s
+#define STR_FMT0(str) ((str) ? (str)->len : 6), ((str) ? (str)->s : "(NULL)")
 #define STR_NULL (str) { NULL, 0 }
 #define STR_EMPTY (str) { "", 0 }