diff --git a/source/src/worldio.cpp b/source/src/worldio.cpp
index 2ad4c376..ef8dd96e 100644
--- a/source/src/worldio.cpp
+++ b/source/src/worldio.cpp
@@ -127,6 +127,7 @@ uchar *readmap(char *name, int *size)
 
 void writecfg(char *name, int size, uchar *data)
 {
+    if (!size) return;
     setnames(name);
     FILE *f = openfile(mcfname, "w");
     if(!f) { conoutf("\f3could not write config to %s", mcfname); return; }