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In tinydns.inc we have the following:

if (!is_dir("{$g['varetc_path']}/etc/dnscache{$dnsidx}/env/IP"))
exec("/bin/mkdir -p {$g['varetc_path']}/etc/dnscache{$dnsidx}/env");
exec("echo {$dnscacheip} > {$g['varetc_path']}/etc/dnscache{$dnsidx}/env/IP");

I believe the correct check would be:

--- a/config/tinydns/tinydns.inc
+++ b/config/tinydns/tinydns.inc
@@ -239,7 +239,7 @@ function tinydns_custom_php_changeip_command() {
                        $dnsuserip = $arr[0];
                        exec("/usr/local/bin/dnscache-conf Gdnscache Gdnslog {$g['varetc_path']}/etc/dnscache{$dnsidx} {$dnscacheip}");
                        exec("/bin/ln -s {$g['varetc_path']}/etc/dnscache{$dnsidx} {$g['varrun_path']}/service/");
-                       if (!is_dir("{$g['varetc_path']}/etc/dnscache{$dnsidx}/env/IP"))
+                       if (!is_dir("{$g['varetc_path']}/etc/dnscache{$dnsidx}/env"))
                                exec("/bin/mkdir -p {$g['varetc_path']}/etc/dnscache{$dnsidx}/env");
                        exec("echo {$dnscacheip} > {$g['varetc_path']}/etc/dnscache{$dnsidx}/env/IP");
                        tinydns_dnscache_forwarding_servers($dnsidx);