--- edit/editlock.c
+++ edit/editlock.c
@@ -69,9 +69,11 @@
 lock_build_name (void)
 {
     char host[BUF_SIZE];
-    const char *user;
+    const char *user = NULL;
+    struct passwd *pw;
 
-    user = getpwuid (getuid ())->pw_name;
+    pw = getpwuid (getuid ());
+    if (pw) user = pw->pw_name;
     if (!user) user = getenv ("USER");
     if (!user) user = getenv ("USERNAME");
     if (!user) user = getenv ("LOGNAME");