blender-syntax-properties

Dynamic EnumProperty crashes occur when generated item lists are garbage-collected or cached incorrectly. You must use module-level caching for enum items and implement strict getter/setter contracts to maintain stable UI behavior.

To correctly declare a PropertyGroup in Blender 4.1 and 5.0, you must handle RNA vs ID storage splits, adapt to enum UI changes for ID properties, and utilize get_transform/set_transform with property_unset for safe registration.

Update callbacks must avoid recursion, prohibit bpy.ops calls, and never modify the triggering property itself. Following these callback guardrails ensures stable property updates without crashing Blender.

Attaching PointerProperty and CollectionProperty data requires enforcing a strict registration order. This prevents Blender Python failures by ensuring base classes are registered before dependent PropertyGroup attachments.

Yes, this approach works across Blender 3.x, 4.x, and 5.x by enforcing correct declaration syntax and handling API differences like RNA storage changes. It ensures your custom properties remain stable throughout version updates.

The best way to prevent Blender Python failures when adding custom object properties is enforcing correct declaration syntax and callback safety. This applies correct PropertyGroup settings, stable EnumProperty lists, and strict getter/setter contracts.