1 files changed, 4 insertions, 2 deletions

diff --git a/src/firejail/main.c b/src/firejail/main.c
index b3a8dcfd7..ba952b1cb 100644
--- a/src/firejail/main.c
+++ b/src/firejail/main.c
@@ -2409,8 +2409,10 @@ int main(int argc, char **argv) {
         int display = x11_display();
         if (display > 0)
                 set_x11_run_file(sandbox_pid, display);
-        flock(lockfd_directory, LOCK_UN);
-        close(lockfd_directory);
+        if (lockfd_directory != -1) {
+                flock(lockfd_directory, LOCK_UN);
+                close(lockfd_directory);
+        }
         EUID_USER();
 
         // clone environment