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Fix stale object reference crash in measure tool snapping

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Drop deleted Blender objects from the snap cache before comparing
names. Accessing an attribute on a removed object raised
ReferenceError ("StructRNA of type Object has been removed"),
crashing detect_snapping_points after an object was deleted.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Ryan Schultz
2026-06-25 11:45:38 -05:00
parent f60a3423d0
commit 3248cc7580
1 changed files with 11 additions and 0 deletions
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src/bonsai/bonsai/tool/raycast.py
+11
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@@ -969,6 +969,17 @@ class Raycast(bonsai.core.tool.Raycast):
def create_snap_obj(cls, obj): def create_snap_obj(cls, obj):
if obj.data is None or not isinstance(obj.data, bpy.types.Mesh): if obj.data is None or not isinstance(obj.data, bpy.types.Mesh):
return None return None
# Drop cache entries whose Blender object has been deleted. Accessing any
# attribute on a removed object raises ReferenceError ("StructRNA ... has
# been removed"), so test validity before comparing names below.
valid_snap_objs = []
for snap_obj in cls.snap_objs:
try:
snap_obj.obj.name
except ReferenceError:
continue
valid_snap_objs.append(snap_obj)
cls.snap_objs[:] = valid_snap_objs
for i, snap_obj in enumerate(cls.snap_objs): for i, snap_obj in enumerate(cls.snap_objs):
if obj.name == snap_obj.obj.name: if obj.name == snap_obj.obj.name:
# Handle objects modified while a modal operator is active. # Handle objects modified while a modal operator is active.