--- a/engine.c	Tue May 17 20:54:05 2005 +0000
+++ b/engine.c	Tue May 17 20:58:58 2005 +0000
@@ -887,7 +887,7 @@
 {
 	StringID str;
 
-	if (!IsEngineIndex(p1)) return CMD_ERROR;
+	if (!IsEngineIndex(p1) || _cmd_text[0] == '\0') return CMD_ERROR;
 
 	str = AllocateNameUnique(_cmd_text, 0);
 	if (str == 0) return CMD_ERROR;