The crash you are experiencing with the Spine 4.2 plugin in UE4.27 seems to be related to an access violation error, which is often caused by attempting to read or write to a null or invalid memory address. This type of error can be difficult to diagnose, especially if it occurs randomly. Based on similar issues discussed in the context, it is recommended to ensure that your Spine runtime and UE4 plugin are up-to-date with the latest versions. Additionally, check if there are any specific steps or conditions that consistently lead to the crash, as this information can be crucial for troubleshooting. If the problem persists, consider reviewing the Spine runtime documentation for any known issues or updates that might address this behavior.

PatrolCat Sorry to hear about the crashes. Unfortunately, in many cases the UE error logs are not detailed enough to pinpoint the cause, so could you please provide a minimal UE project that can reproduce the problem via email?: contact@esotericsoftware.com
Please include the URL of this forum thread in the email so we know the context. Then we can take a look at what's wrong.

The sample project requires UE 5.5 as of yesterday. It's sadly impossible to keep the example project working with all UE versions we support. That said, the plugin itself works with UE 4.27 too. There's not much reason to use UE 4.27 anymore though.