This is a simple mod that removes the null spawn chance from the eight (as of 3.1) non-AI anomalies that have it, so it will never silently fail to spawn. Three of these are pretty tame (I'm not sure why two of them are even so restricted), but four of them are rather powerful.

These are (Spoilered)

• Teapot
• Cosmic Diamond (gives physics research to a star... I'm not sure why this has a NSC)
• Extremophiles (gives a gas deposit on a molten world - also not sure)
• Rubricator chain (A relic world and an a relic - not as broken as it once was, but still)
• Vol chain (Paradise planet)
• Alien Device (Wormhole maker)
• Impossible Organism - Nivlacs (I still have yet to get this one)

My Main Stellaris Mods
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These are intended to be balanced, suitable for multiplayer, etc.

• Unofficial Patch fixing hundreds of bugs in vanilla Stellaris.
• Yet Another Galaxy Enhancement Mod - Adds new galaxy sizes, star names to fit, and tweaks galaxy generation slightly.
• Bypass Adjustments - Some small tweaks to wormholes (you won't pull the lever and piss off a Fallen Empire any more). Major overhaul for Gateways, making them feel a lot more strategic in the endgame by making them require black holes. Also blocks Fallen Empires, random empires, and space critters from using your Gateways.
• Sensor Expansion - Adds more functionality to sensor tech.

My Other Stellaris Mods
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These are not balanced, and drastically increase the player's power.

• All Anomaly Spawns - Removes the null spawn chance from the anomalies that have it, allowing you to get all anomalies.
• Free Galatron With Purchase - Makes the Galatron and ancient trade routes exceptionally likely results. Also how I discovered you could end up with more than one Galatron in a Galaxy. I wrote this because I have yet to obtain it normally. This should only be used in Multiplayer where everyone is aware that whoever opens the first reliquary gets the Galatron.
• Assorted Precursor Adjustments - Currently this just makes it so that you can get all precursors. Remaining issues this addressed were addressed by Paradox.