# Forum:Debug assertion failed!
&lt; Forum:Watercooler

OK, I've seen this a few times.
I accidently hit the "/", so it wants to search.
I hit "." when the cursor is in the blackness outside the corridors/rooms.
I get a pop-up window saying, in part:
Microsoft Visual C++ runtime Library
X Debug Assertion Failed!
Program 

<long directory="" from="" home="" my="" path="">\isctype.c 
Line: 56
Expression: c&gt;=-1&amp;&amp;c&lt;=256

Martyf (talk) 22:59, 23 September 2017 (UTC)

Which version of Windows? I believe this is fixed in development, and at least I can't get it to happen there. ——paxed (talk) 07:04, 24 September 2017 (UTC)
This strikes a bell.  I had found a problem last year and posted a pull request that fixed some similar assertions.  PatR submitted the changes on 7/9/2016 "add '(uchar)' casts to ctype calls. --barthouse

Windows 10.
- marty
04:31, 1 October 2017 (UTC)

</long>