There are 2 different versions of Ini++ available on the extension manager. The old one is called "Ini++" in both the extension manager and within Fusion. The new one is called "Ini++ Object" in the extension manager and "Ini++ v1.5 Object" within Fusion. The file in the extension folder for the older Ini++ extension is "Ini++.mfx" and the name for the newer version in the extension folder is "Ini++15.mfx".
The newer Ini++ object was updated on April 2nd, 2019. It was updated to work with the Fusion 2.5+ DLC, as there was a crash bug related to using the previous version with objects that had more than 26 alterable values.
It's very important to not attempt mixing and matching the events from the old "Ini++" extension with the newer "Ini++ v1.5 Object" extension or the other way around. Dragging the events from one Ini++ extension to another in the Event Editor will look like nothing happened as it does not create a check-mark, but it actually WILL create the action of one version of the Ini++ extension inside the other version. This is only visible afterwards if you look at the events from within the Event List Editor.
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I can't say for certain, but it sounds as though the crash you are having might have something to do with using actions from the newer "Ini++ v1.5 Object" inside the old "Ini++ Object", or the other way around. I just tested it myself and indeed I get a crash if I try to use the new version of the 'Load' action with the older version of Ini++, which makes sense.
I would recommend that you use the newer Ini++ v1.5 Object / Ini++15.mfx version of the extension unless there's some important reason that you need to use the older version. It has more features than the older version and will also work with 2.5+, if you ever decide to get that. If you really don't want to use the newer version, then you should make sure the older version of Ini++ in your project isn't using any of the newer versions actions or conditions, and remove the newer version from your project if you don't need it.