core: fix crash with /eval when the current buffer is closed in a command

CHANGELOG.md

@@ -14,6 +14,7 @@ SPDX-License-Identifier: GPL-3.0-or-later
 
 ### Fixed
 
+- core: fix crash with /eval when the current buffer is closed in a command
 - core: fix buffer size in function util_parse_time, causing buffer overflow error in unit tests
 - irc: fix unit of server option `anti_flood` from seconds to milliseconds in output of `/server listfull`
 - irc: fix creation of irc.msgbuffer option without a server name

src/core/core-command.c

@@ -2469,6 +2469,16 @@ COMMAND_CALLBACK(eval)
                 {
                     for (ptr_command = commands; *ptr_command; ptr_command++)
                     {
+                        if (!gui_buffer_valid (buffer))
+                        {
+                            buffer = gui_current_window->buffer;
+                            if (pointers)
+                            {
+                                hashtable_set (pointers, "window",
+                                               gui_window_search_with_buffer (buffer));
+                                hashtable_set (pointers, "buffer", buffer);
+                            }
+                        }
                         result = eval_expression (*ptr_command, pointers, NULL,
                                                   options);
                         if (result)