Fix special-command-p for empty lines

diff --git a/empire.lisp b/empire.lisp
index 8ce62fb2fb88d38e21f91b1326d9d4a160ddb206..eb75bfcf77d9ee1b3838a2d08bea733ba97b2927 100644 (file)
--- a/empire.lisp
+++ b/empire.lisp
@@ -263,7 +263,8 @@
 (defparameter +special-command-char+ #\;)
 
 (defun special-command-p (line)
-  (char= +special-command-char+ (aref line 0)))
+  (and (> (length line) 0)
+       (char= +special-command-char+ (aref line 0))))
 
 (defmethod special-xup ((c connection))
   t)