In reply to the previous comments:

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Mickmane 7 hours ago
Hiya. :) I really like the auto-summoning, but it doesn't work properly.

Spooky armor, and Acorn Bracelet from the Infinite Minions mod.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2821690764

It only summons 2 minions, even though history has 6 saved. When I remove and put back the spooky armor, I can manually summon more minions. Which kind of defeats the point of the Automatic Minion History Book. :)

Could you fix this please?

Thanks! :)

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Vlidmir Putan 5 hours ago
I've just tested it with the gear you mentioned + a summon that only occupies 1 slot (slime staff) and it summoned 6 minions for me

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Vlidmir Putan 5 hours ago
it's likely you experience a silent exception which would be logged. Go to the discord (linked in the mod description above) and ask for help there

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Discord isn't an option, but comments are awkward, so I thought I could paste the excerpt of the log here, and possible more info.

I also used Slime Staff earlier, by now it's Flinx.

The dedicated server window already says "Object reference not set to an instance of an object. (see server.log for full trace)" upon joining.

I'm the host, btw. Doing a separate server so friends and I can leave and get something from another character or world at will.

Log excerpt:

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[14:45:58.330] [Main Thread/INFO] [Terraria]: Mickmane has joined.
[14:45:58.878] [Main Thread/WARN] [tML]: Silently Caught Exception:
System.NullReferenceException: Object reference not set to an instance of an object.
at Terraria.Lighting.GetColor(Int32 x, Int32 y) in tModLoader\Terraria\Lighting.cs:line 186
at Terraria.Projectile.AI_067_FreakingPirates() in tModLoader\Terraria\Projectile.cs:line 31714
at Terraria.Projectile.VanillaAI() in tModLoader\Terraria\Projectile.cs:line 20754
at DMD<Terraria.ModLoader.ProjectileLoader::ProjectileAI>(Projectile projectile)
at SummonersAssociation.Items.MinionControlRod.ResetFriendlyAndChaseable(orig_ProjectileAI orig, Projectile self) in SummonersAssociation\Items\MinionControlRod.cs:line 550
at Terraria.Projectile.Update(Int32 i) in tModLoader\Terraria\Projectile.cs:line 11718
at DMD<Terraria.Main::DoUpdateInWorld>(Main this, Stopwatch sw)
at Terraria.Main.DoUpdate(GameTime& gameTime) in tModLoader\Terraria\Main.cs:line 13152
at Terraria.Main.Update(GameTime gameTime) in tModLoader\Terraria\Main.cs:line 12707
at Terraria.Main.DedServ_PostModLoad(Boolean& reloadMods) in tModLoader\Terraria\Main.cs:line 4666
at Terraria.Main.DedServ() in tModLoader\Terraria\Main.cs:line 4201
at Terraria.Program.LaunchGame_(Boolean isServer) in tModLoader\Terraria\Program.cs:line 233
at Terraria.Program.LaunchGame(String[] args, Boolean monoArgs) in tModLoader\Terraria\Program.cs:line 192
at MonoLaunch.<>c__DisplayClass1_0.<Main>b__0() in tModLoader\Terraria\MonoLaunch.cs:line 56
at System.Threading.Thread.StartCallback()

[14:46:10.369] [Server Loop Thread/INFO] [Network]: [0][127.0.0.1:(port) (Mickmane)] Terminating: Connection lost
[14:46:10.370] [Server Loop Thread/INFO] [Network]: [0][127.0.0.1:(port) (Mickmane)] Closing TcpSocket
[14:46:10.370] [Server Loop Thread/INFO] [Terraria]: Mickmane has left.
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I removed the (port) because I am too ignorant to know whether that's sensitive information. :)

I'm using a pile of other mods, and hope not one of them is at fault. Maybe you can tell from the logfile excerpt? (The whole thing is 36k, a bit much to paste.)

My current modlist:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2789200592

Thanks for any help! :)