Fixed addon crash issues when a non-valid number/string is given.

changecall.lua

@@ -25,7 +25,7 @@
 
 _addon.author   = 'atom0s';
 _addon.name     = 'ChangeCall';
-_addon.version  = '1.0.1';
+_addon.version  = '1.0.2';
 
 require 'common'
 
@@ -48,7 +48,7 @@ ashita.register_event('command', function(command, ntype)
     
     -- Pull the new call id to use..
     local callid = string.gsub(command, '/changecall', ''):trim();
-    if (callid == nil or string.len(callid) == 0) then
+    if (callid == nil or string.len(callid) == 0 or tonumber(callid) == nil) then
         settings.callid = 0;
     else
         settings.callid = tonumber(callid);