diff --git a/src/log.c b/src/log.c
index 6331b0df..42a2ec17 100644
--- a/src/log.c
+++ b/src/log.c
@@ -192,6 +192,8 @@ static void print_backtrace(unsigned int offset)
 		buf[len] = '\0';
 
 		pos = strchr(buf, '\n');
+		if (!pos)
+			break;
 		*pos++ = '\0';
 
 		if (strcmp(buf, "??") == 0) {