diff --git a/src/openvpn/tun_afunix.c b/src/openvpn/tun_afunix.c
index 4d48a31..124db6d 100644
--- a/src/openvpn/tun_afunix.c
+++ b/src/openvpn/tun_afunix.c
@@ -128,7 +128,12 @@
         close(tt->fd);
         tt->fd = 0;
     }
-    kill(tt->afunix.childprocess, SIGINT);
+    /* only kill the child process if the PID is not 0 to avoid killing
+     * ourselves by accident */
+    if (tt->afunix.childprocess)
+    {
+        kill(tt->afunix.childprocess, SIGINT);
+    }
 
     free(tt->actual_name);
     free(tt);