Bad argument #1 to 'pairs

Hello. r868.
Error occurs when I opened builder UI.
hotkey_save.zip (6.6 MB)

release-868 (x64)[M]
radiant/modules/effects/effect_tracks.lua:41: bad argument #1 to 'pairs' (table expected, got nil)
stack traceback:
	[C]: in function 'pairs'
	radiant/modules/effects/effect_tracks.lua:41: in function '__init'
	radiant/modules/commons.lua:23: in function 'EffectTracks'
	radiant/modules/effects/effect_manager.lua:159: in function '_add_effect'
	radiant/modules/effects/effect_manager.lua:138: in function 'start_exact_effect'
	radiant/modules/effects/effect_manager.lua:125: in function 'start_effect'
	radiant/modules/effects.lua:13: in function 'run_effect'
	..._resource_node/renewable_resource_node_component.lua:158: in function 'spawn_resource'
	...h/ai/actions/harvest_renewable_resource_adjacent.lua:44: in function <...h/ai/actions/harvest_renewable_resource_adjacent.lua:28>
	[C]: ?
	[C]: ?
	...
	[C]: in function 'run'
	stonehearth/components/ai/ai_component.lua:537: in function <stonehearth/components/ai/ai_component.lua:521>
	[C]: in function 'xpcall'
	radiant/modules/commons.lua:73: in function 'xpcall'
	stonehearth/components/ai/ai_component.lua:521: in function '_thread_main'
	stonehearth/services/server/threads/thread.lua:278: in function <stonehearth/services/server/threads/thread.lua:275>
	[C]: in function 'xpcall'
	radiant/modules/commons.lua:73: in function 'xpcall'
	stonehearth/services/server/threads/thread.lua:275: in function 'f'
	radiant/lib/env.lua:15: in function <radiant/lib/env.lua:14>

2nd

	release-868 (x64)[M]
stack traceback:
	[C]: ?
	[C]: ?
	[C]: ?
	[C]: in function 'run'
	stonehearth/services/server/tasks/task_action.lua:198: in function <stonehearth/services/server/tasks/task_action.lua:195>
	[C]: ?
	[C]: ?
	[C]: in function 'run'
	...nehearth/services/server/tasks/task_group_action.lua:137: in function <...nehearth/services/server/tasks/task_group_action.lua:125>
	[C]: ?
	[C]: ?
	...
	[C]: in function 'run'
	stonehearth/components/ai/ai_component.lua:537: in function <stonehearth/components/ai/ai_component.lua:521>
	[C]: in function 'xpcall'
	radiant/modules/commons.lua:73: in function 'xpcall'
	stonehearth/components/ai/ai_component.lua:521: in function '_thread_main'
	stonehearth/services/server/threads/thread.lua:278: in function <stonehearth/services/server/threads/thread.lua:275>
	[C]: in function 'xpcall'
	radiant/modules/commons.lua:73: in function 'xpcall'
	stonehearth/services/server/threads/thread.lua:275: in function 'f'
	radiant/lib/env.lua:15: in function <radiant/lib/env.lua:14>

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