Index: openacs-4/packages/chat/tcl/chat-ajax-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/chat/tcl/chat-ajax-procs.tcl,v
diff -u -r1.27 -r1.28
--- openacs-4/packages/chat/tcl/chat-ajax-procs.tcl	21 Nov 2018 09:56:37 -0000	1.27
+++ openacs-4/packages/chat/tcl/chat-ajax-procs.tcl	21 Nov 2018 12:32:18 -0000	1.28
@@ -37,14 +37,7 @@
             return [_ chat.Room_not_found]
         } else {
             chat_room_get -room_id $chat_id -array c
-            next \
-                -chat_id $chat_id \
-                -package_id $c(context_id) \
-                -mode $mode \
-                -path $path \
-                -login_messages_p $c(login_messages_p) \
-                -logout_messages_p $c(logout_messages_p) \
-                -timewindow $c(messages_time_window)
+            next -chat_id $chat_id -package_id $c(context_id) -mode $mode -path $path
         }
     }
 
@@ -66,6 +59,12 @@
             ad_return_forbidden
             ad_script_abort
         }
+        if {[chat_room_exists_p ${:chat_id}]} {
+            chat_room_get -room_id ${:chat_id} -array c
+            set :login_messages_p  $c(login_messages_p)
+            set :logout_messages_p $c(logout_messages_p)
+            set :timewindow        $c(messages_time_window)
+        }
         next
     }