--- /dev/null
+--- dx-4.4.4/src/uipp/dxuilib/EditorWindow.C.orig 2018-05-16 05:56:15.975434667 +0200
++++ dx-4.4.4/src/uipp/dxuilib/EditorWindow.C 2018-05-16 05:56:19.555623422 +0200
+@@ -5997,7 +5997,7 @@
+ //
+ const char *tmpdir = theDXApplication->getTmpDirectory();
+ int tmpdirlen = STRLEN(tmpdir);
+- if (!tmpdirlen) return FALSE;
++ if (!tmpdirlen) return NUL(char*);
+ if (tmpdir[tmpdirlen-1] == '/') {
+ sprintf(netfilename, "%sdx%d.net", tmpdir, getpid());
+ sprintf(cfgfilename, "%sdx%d.cfg", tmpdir, getpid());