Skyrim Crashing on Load Whenever completing a quest for the mod "Vigilant"

[Double G]

So I attempted completing a quest for the mod Vigilant titled "Lazy Afternoon" where you are supposed to exterminate a summoned Daedra in Candlehearth Hall located in Windhelm. Upon quest completion any save I try loading no matter where I am causes a CTD during the loading screen. Any ideas what causes this? Whenever loading back to an earlier save the game seems stable and working correctly.

[fauxpas]

What other mods do you have and why aren't you asking this question on the mod page instead of here?

[Double G]

I've attempted to get assistance from the mod page but to no avail. Not very many people checking the comments these days I suppose. Anyways, my apologies for not giving my load order. Here it is:
0 0 Skyrim.esm
1 1 Update.esm
2 2 Dawnguard.esm
3 3 HearthFires.esm
4 4 Dragonborn.esm
5 5 Lanterns Of Skyrim - All In One - Main.esm
6 6 Unofficial Skyrim Special Edition Patch.esp
7 7 BSAssets.esm
8 8 BSHeartland.esm
9 9 BS_DLC_patch.esp
10 a DeadlySpellImpacts.esp
11 b Lore Weapon Expansion - Daedric Crescent.esp
12 c Lore Weapon Expansion - Goldbrand.esp
13 d Lore Weapon Expansion - Relics of the Crusader.esp
14 e SMIM-SE-Merged-All.esp
15 f Immersive Sounds - Compendium.esp
16 10 EnhancedLightsandFX.esp
17 11 SoundsofSkyrimComplete.esp
18 12 3DNPC.esp
19 13 Cutting Room Floor.esp
20 14 ArtifactsOfBoethiah.esp
21 15 dD-No Spinning Death Animation.esp
22 16 DeadlySpellImpacts - Two Fire.esp
23 17 Skycutter.esp
24 18 skyforgedWeapons.esp
25 19 WeightLessLegacyAll.esp
26 1a Potions.esp
27 1b dD - Realistic Ragdoll Force - Realistic.esp
28 1c S3DTrees NextGenerationForests.esp
29 1d CollegeOfWinterholdImmersive.esp
30 1e MagicalCollegeofWinterhold.esp
31 1f WARZONES - SSE - Civil Unrest.esp
32 20 Distinct Interiors.esp
33 21 Distinct Interiors - Inns.esp
34 22 Distinct Interiors - Shops.esp
35 23 Book Covers Skyrim.esp
36 24 Skyrim Immersive Creatures Special Edition.esp
37 25 Blues Skyrim.esp
38 26 SkyTEST-RealisticAnimals&Predators.esp
39 27 BirdsOfSkyrim_SSE.esp
40 28 Fort(ified) Dawnguard.esp
41 29 Hothtrooper44_Armor_Ecksstra.esp
42 2a Hothtrooper44_ArmorCompilation.esp
43 2b Lore Weapon Expansion.esp
44 2c SOFA-DunmerAll.esp
45 2d Distinct Interiors - Guilds.esp
46 2e Distinct Interiors - Miscellaneous.esp
47 2f MCoW_ELFX.esp
48 30 SoS_ELFX_Patch.esp
49 31 loners_sword.esp
50 32 Populated Lands Roads Paths Legendary.esp
51 33 marriagemod - alpha v3.esp
52 34 ethereal_elven_overhaul.esp
53 35 mihailrusticweaponspack.esp
54 36 TKAA.esp
55 37 Kato's Falkreath.esp
56 38 MIHAILwaterhag.esp
57 39 Improved Adoptions.esp
58 3a Improved Adoptions Patch.esp
59 3b BirdsAndFlocks_SSE.esp
60 3c JK's Riverwood.esp
61 3d Raven Rock.esp
62 3e Improved Adoptions DLC houses.esp
63 3f fallentreebridgesSSE.esp
64 40 More idle markers.esp
65 41 mihailanimalbones.esp
66 42 cmuse_yumi_adoptable.esp
67 43 Unique Dragon Aspect.esp
68 44 LWPlayerHeadTracking.esp
69 45 Billyro Swords.esp
70 46 dD - Enhanced Blood Main.esp
71 47 dD-Medium Script Range.esp
72 48 KS Dragon Overhaul 2.esp
73 49 Durnehviir God of Death.esp
74 4a DurnehviirResurrected.esp
75 4b DurnehviirResurrected_GodOfDeath_patch.esp
76 4c WeightLessTrueSoulGems.esp
77 4d RUSTIC SOULGEMS - Sorted.esp
78 4e mihailtempleguardians.esp
79 4f Unique Uniques.esp
80 50 icepenguinworldmapclassic.esp
81 51 3rdEraWeaponsMoS.esp
82 52 SkyHavenTempleGarden.esp
83 53 Populated Cities Towns Villages Legendary.esp
84 54 Immersive Patrols II.esp
85 55 InsanitySorrow Weapons Pack.esp
86 56 Billyro's Weapons.esp
87 57 mihailimperialhalberds.esp
88 58 mihailslenderman.esp
89 59 mihaildracolizards.esp
90 5a MihailSolstheimGuarsV1.esp
91 5b mihailcliffracer.esp
92 5c ZIA_Daedric Pack_V4.esp
93 5d notice board.esp
94 5e mihailfogling.esp
95 5f Prometheus_BeastSkeletons.esp
96 60 mihailczart.esp
97 61 mihailbearsofcyrodiil.esp
98 62 mihailcrystalgolem.esp
99 63 mihailmudcrabmerchant.esp
100 64 mihailtoadprince.esp
101 65 mihailvampirebeasts.esp
102 66 mihailmmasithis.esp
103 67 SolitudeTempleFrescoes.esp
104 68 BetterQuestObjectives.esp
105 69 AK- Namira for Good Guys.esp
106 6a mihailguarsofsolstheimup1v2.esp
107 6b mihailkagouti.esp
108 6c armored-horses.esp
109 6d mihailrottenmaidens.esp
110 6e MCoW_Cutting Room Floor.esp
111 6f Joy of Perspective.esp
112 70 CWICRFSEPatch.esp
113 71 DawnguardArsenal.esp
114 72 Faction Crossbows.esp
115 73 mihailwolvesofcyrodiil.esp
116 74 The Paarthurnax Dilemma.esp
117 75 nwsMirabelleFollower.esp
118 76 mihailcurseddoll.esp
119 77 mihailicetitan.esp
120 78 mihailterrorbirds.esp
121 79 PaladinArtifactsAndArmor.esp
122 7a mihailcyrodiilianspriggan.esp
123 7b mihaillesserwerewolf.esp
124 7c CollegeStudents.esp
125 7d icebladeofthemonarch.esp
126 7e mihailoldgod.esp
127 7f mihailmegalania.esp
128 80 AK- Boethiah Alternate.esp
129 81 ZTH_V4.esp
130 82 Zikoru Swords.esp
131 83 marriagemod - hf.esp
132 84 SMIM-Bruma-Patch.esp
133 85 Notice Board MCM.esp
134 86 mihailesocenturion.esp
135 87 mihailguarsREDONE-addon2.esp
136 88 mihailtreeofsouls.esp
137 89 3DNPC TKAA Patch.esp
138 8a BSHeartland TKAA Patch.esp
139 8b Bijin Warmaidens.esp
140 8c WeightLessTrueScrolls.esp
141 8d GQJ_DG_vampireamuletfix.esp
142 8e BottlesOfSkyrim.esp
143 8f SolitudeTempleFrescoesBig.esp
144 90 SolitudeTempleFrescoesExpanded.esp
145 91 SolitudeTempleFrescoesSmall.esp
146 92 imp_helm_legend.esp
147 93 Fantasy Soundtrack Project - Combat.esp
148 94 Fantasy Soundtrack Project.esp
149 95 Beards.esp
150 96 ISC Enhanced Blood Patch.esp
151 97 BVFE.esp
152 98 Improved Eyes Skyrim.esp
153 99 InigoPerkPointGiver.esp
154 9a Unlimited Shouting.esp
155 9b Dr_Bandolier.esp
156 9c Keeping Warm.esp
157 9d Dual Blocking for Idiots v1.35a.esp
158 9e UltimateCombat.esp
159 9f VioLens SE.esp
160 a0 TKDodge.esp
161 a1 Cutting Room Floor TKAA Patch.esp
162 a2 No NPC Greetings.esp
163 a3 SeeEnchs.esp
164 a4 WeightLessTrueCrafting.esp
165 a5 WeightLessTrueGems.esp
166 a6 WeightLessTrueIngredients.esp
167 a7 WerewolfPerksExpanded.esp
168 a8 BetterQuestObjectives-DBForevertoMisc.esp
169 a9 BetterQuestObjectives-PaarDilemmaPatch.esp
170 aa JoP - Immersive Armors Patch.esp
171 ab YOT - Your Own Thoughts.esp
172 ac WondersofWeather.esp
173 ad Visible Favorited Gear.esp
174 ae Runandwalkpaces.esp
175 af Moonlight Tales Special Edition.esp
176 b0 YOT - Moonlight Tales Overhaul.esp
177 b1 WetandCold.esp
178 b2 Footprints.esp
179 b3 SkyUI_SE.esp
180 b4 SkyHUD.esp
181 b5 HelmetToggle.esp
182 b6 SOFA-CommonBeds.esp
183 b7 SOFA-CommonContainers.esp
184 b8 SOFA-CommonSeatsAndTables.esp
185 b9 SOFA-CommonShelvesAndCrates.esp
186 ba SOFA-BarAndCounters.esp
187 bb SOFA-Farm.esp
188 bc SOFA-Washbasin.esp
189 bd SOFA-Crates.esp
190 be SOFA-FlatDivider.esp
191 bf SOFA-NobleBeds.esp
192 c0 AMatterOfTime.esp
193 c1 Dolomite Weathers.esp
194 c2 dovahkiinrelax.esp
195 c3 FNIS.esp
196 c4 DiverseDragonsCollectionSE.esp
197 c5 SoS_DolomiteWeathers_Patch.esp
198 c6 FireBurns.esp
199 c7 ZMS_V4.esp
200 c8 ZNI_V4.esp
201 c9 ZIA_Ancient Pack_V4.esp
202 ca Unlimited Training Slow Skill Usage Leveling 67%.esp
203 cb Valerica.esp
204 cc Serana.esp
205 cd Apex Werewolf.esp
206 ce EEO CRF patch.esp
207 cf Wildcat - Combat of Skyrim.esp
208 d0 Alternate Start - Live Another Life.esp
209 d1 BetterQuestObjectives-AlternateStartPatch.esp
210 d2 Immersive Citizens - AI Overhaul.esp
211 d3 Relationship Dialogue Overhaul.esp
212 d4 RDO - CRF + USSEP Patch.esp
213 d5 Serana Dialogue Edit.esp
214 d6 RealisticWaterTwo.esp
215 d7 Bashed Patch, 0.esp
216 d8 Bijin NPCs.esp
217 d9 Bijin Wives.esp
218 da Palaces Castles Enhanced.esp
219 db PCE - No Custom Music patch.esp
220 dc PCE - ELFX PATCH.esp
221 dd PCE - Immersive Citizens AI Overhaul Patch.esp
222 de PCE - USSEP+CRF Patch.esp
223 df Vigilant.esp
224 e0 Vigilant Voiced.esp
225 e1 RaceMenu.esp
226 e2 RaceMenuPlugin.esp

Given the size of my load order I wouldnt be surprised if there was some sort of conflict, but I do not know what that conflict may be. I already used LOOT and SSEEdit to clean my files and sort mods.

[Grumpy]

2 things first:

#1 Sort that load order, or why is racemenu at the bottom?
#2 you have alot! of mihail mods, which are known to increase instability and decrease performance

[smr1957]

It is highly recommended that you DO NOT use Mihail mods - even one can possibly be too many. They can add hundreds, or in the case of the number you have, thousands of npcs and their records - all of which the game is trying to run. Consider this, two of the most performance unfriendly areas of the game - and potentially most CTD causing are Whiterun and Riften. Those areas add just 15 or twenty npcs. Imagine every cell loading that many - or twice or three times as many - or more.

While his mods are very nice looking, they are poorly designed and developed. They are best looked at, and not downloaded or installed.

[smr1957]

Needless to say, you will have to start a new game - or go back to a save from before any of those mods were installed. See:
Resetting SkyrimSE to Vanilla or A Clean Reinstall by grimus -
http://steamcommunity.com/app/489830/discussions/0/312265589446940121/

Any mod that causes any type of instability in your game should be avoided or dumped - regardless of how good it sounds or nice it may look. If it causes problems with your game, it is useless.

Strictly following that rule is the reason I am able to construct the mod loads that I do - all completely stable and CTD free.

[Double G]

So I went ahead and disabled ALL the Mihail mods and loaded an earlier save prior to completing the quest for the mod Vigilant. Everything seems to be running smoothly with no issues to speak of. However, it seems the crashes are all directly linked solely on me completing a specific quest as I mentioned earlier. The strange thing about it is the game does not crash right away or at all upon its completion in the conventional sense, only when I save, exit, and try to load the said save that it CTD's no matter where i was in Skyrim. I may just have to avoid anything having to do with the mod altogether unless I can pinpoint the exact reason for its instability.

[Grumpy]

does the crash on save happens also in a new game?

[Double G]

No, I probably should try to re-explain. I do not get any crashes whatsoever, only when attempting to do a quest for the mod Vigilant, otherwise the game is quite stable. It is very bizarre as the crash only ever occurs when I complete the quest and try loading any save, even autosaves, after completing that quest. If I were to just continue playing without loading s save after completing the quest the game shows no signs of crashing or instability.
To sum it up: I finish a quest for a mod, I can play normally unless I attempt to load any save after completing it in which I ctd in the loading screen.

[Mringasa]

Are you sure that was sorted with LOOT? Your bashed patch is in an odd place, and RaceMenu is as well... FNIS is in an odd place too. From my perspective at least.

You're also running Immersive College of Winterhold + Magical College of Winterhold. These two are incompatible iirc because they alter a lot of same things.

What kind of texture replacers are you using? They won't show up in your load order since they don't use plugins. How much VRAM do you have and are you using 4k or 2k replacers if any?

[Grumpy]

So tested the mod myself, because bored and bla. and I dont have any load or save issues after the lazy afternoon quest. which indicates its not a general problem with the vigilant mod, at least thats my assumptions currently.

(my load order is pretty vanilla)

[Genryū Ōkami]

Solved :D remove the KS Dragon Mod, for some reason, it causes conflict with the Vigilant mod. I have tested it myself by saving and loading the game up from start over and over again, the save file is no longer crashing after the Lazy Afternoon quest. I hope this helps.