[1.15.2] Legend of Wesmere s3 Dialogue Crash

[Kanzzer]

At the beginning of S3, the following error logs showed up along with the mission's dialogue. I could proceed to play the mission though, and I defended for 7 turns.

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20200129 01:22:41 error scripting/lua: campaigns/Legend_of_Wesmere/lua/wml_tags.lua:45: bad argument #1 to 'gmatch' (string expected, got nil)
stack traceback:
	[C]: in function 'string.gmatch'
	campaigns/Legend_of_Wesmere/lua/wml_tags.lua:45: in local 'cmd'
	lua/wml-utils.lua:145: in field 'handle_event_commands'
	lua/wml-flow.lua:6: in function <lua/wml-flow.lua:5>
	[C]: in field 'fire_event'
	lua/wml-tags.lua:153: in local 'cmd'
	lua/wml-utils.lua:145: in field 'handle_event_commands'
	lua/wml-flow.lua:6: in function <lua/wml-flow.lua:5>

However, after Kalenz and Landar showed up, the same errors occurred again, and this time after the dialogue was clicked through, I was defeated.

I cannot proceed with the mission in any ways.

Below is the build info. I have also attached the save file.

Please help! Thank you very much.

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The Battle for Wesnoth version 1.15.2
Running on Microsoft Windows 7 Service Pack 1 (6.1.7601)

Libraries
=========

Boost:             1.71
OpenSSL/libcrypto: 1.1.1d (runtime 1.1.1d)
Cairo:             1.16.0 (runtime 1.16.0)
Pango:             1.43.0 (runtime 1.43.0)
SDL:               2.0.10 (runtime 2.0.10)
SDL_image:         2.0.5  (runtime 2.0.5)
SDL_mixer:         2.0.4  (runtime 2.0.4)
SDL_ttf:           2.0.15 (runtime 2.0.15)

Features
========

JPG screenshots:                yes
Lua console completion:         yes
Legacy bidirectional rendering: yes
Win32 notifications back end:   yes

*edited for grammar.