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-rw-r--r--test/birdtest.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/test/birdtest.c b/test/birdtest.c
index 484205d2..9f7ab583 100644
--- a/test/birdtest.c
+++ b/test/birdtest.c
@@ -199,7 +199,8 @@ bt_log_result(int result, const char *fmt, va_list argptr)
(fmt && strlen(fmt) > 0) ? ": " : "");
pos = msg_buf + strlen(msg_buf);
- vsnprintf(pos, sizeof(msg_buf) - (pos - msg_buf), fmt, argptr);
+ if (fmt)
+ vsnprintf(pos, sizeof(msg_buf) - (pos - msg_buf), fmt, argptr);
int chrs = 0;
for (uint i = 0; i < strlen(msg_buf); i += get_num_terminal_cols())