hi there, is there any way to find out what plugin is causing the problem?
Some plugins require an updated version to function with SketchUp 2025 and cannot simply be copied over using the migration extension.
ok … mea culpa… for the whole point of a migration is that somehow magically there is the background check for the compatibility and the auto deselect of incompatible plugins or better a autoconversion 
… maybe i was dreaming lucidly while thinking this - idk
so for the moment its not a bug, its a feature ok
Have you tried renaming / moving the extensions folder and restarting?
I am having a similar issue in 2024 at the moment…sketchup says an extension is causing it to crash but does not obviously identify which one…
Yes this sounds nice, but the reality is that it is simply a copy wizard.
An extension itself has no way of knowing what SketchUp versions it is compatible with, nor can the extension see into the future to know if some future version of Ruby or SketchUp will cause it to crash or misbehave.
Currently, it is only the Extension Warehouse store page for an extension that has a manually entered list of compatible SketchUp versions. An extension object cannot currently check the EW website to know whether or not it should load into a SketchUp application process.
This discussion might give @ene_su some ideas.
So, the responsibility is still on the user to migrate one at a time or in small sets and run the new SketchUp version and test before migrating the next small set of extensions.
When an extension fails to load, SketchUp should be able to start regardless and display a load error message, allowing you to update or uninstall the affected extension. SketchUp not starting is not an expected outcome here and we need to look further into why this issue occurred.
What exact behavior are you seeing? Is there a bugsplat? Feel free to share screenshots so we can investigate.
To get out of this situation, you could go to the SketchUp plugins folder and remove a few extensions at a time until SketchUp starts working again. Then add back the last extensions you removed one at a time until SketchUp fails to start, to verify what exact extension causes the issue. Knowing exactly what extension causes this would greatly help us improve the stability of SketchUp!
This approach can be used for debugging but is not the recommended workflow. The recommended workflow is to select all the extensions you want and run the migrator once. Then SketchUp should be able to properly handle any load errors that might occur.
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Could you share what exact error messages you are seeing? This would greatly help us investigate the issue.
Thanks for sharing this!
I’m personally not familiar with this error message. Does SketchUp launch without any extensions at all if you skip extensions? Does it keep crashing if you chose to load them?
it depends! this morning it was able to start…over times it crashes.