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Are you starting the server from the command line then closing the console? The other errors will be mostly harmless, but that doesn't necessarily mean it is not something broken in the mods. e.g. createplus is trying to add a recipe for a mekanism item, which you don't have installed. While this looks like a broken recipe file for createadditions, but it also has the name "unknown_ingot_recipe" so who knows except the mod author? 🙂 All it means is you can't use this recipe for crafting. You could report it as a bug to the mod authors that they are not using "conditional recipes" which would avoid this kind of logging spam. https://docs.minecraftforge.net/en/latest/resources/server/conditional/ but they would probably consider it low priority?

A Double value should never be null. If you wish to disable the logic use a value which will deactivate the code (like 0). Then execute the code only if the value not the deactivation value (in this case is larger than 0).