1 files changed, 3 insertions, 0 deletions

diff --git a/snac.c b/snac.c
index 683ff40..1ea61ff 100644
--- a/snac.c
+++ b/snac.c
@@ -79,6 +79,9 @@ double ftime(void)
 int validate_uid(const char *uid)
 /* returns if uid is a valid identifier */
 {
+    if (!uid || *uid == '\0')
+        return 0;
+
     while (*uid) {
         if (!(isalnum(*uid) || *uid == '_'))
             return 0;