diff --git a/source/blender/io/usd/intern/usd_reader_stage.cc b/source/blender/io/usd/intern/usd_reader_stage.cc
index e8f7b8ee890..2bccbaa75d2 100644
--- a/source/blender/io/usd/intern/usd_reader_stage.cc
+++ b/source/blender/io/usd/intern/usd_reader_stage.cc
@@ -907,19 +907,25 @@ void USDStageReader::collect_point_instancer_proto_paths(const pxr::UsdPrim &pri
   pxr::UsdPrimSiblingRange children = prim.GetFilteredChildren(filter_flags);
 
   for (const auto &child_prim : children) {
-    const pxr::UsdGeomImageable imageable = pxr::UsdGeomImageable(child_prim);
-    if (!imageable) {
-      continue;
-    }
 
-    /* We should only traverse through a hierarchy, and any potential instancers, if they would be
-     * included by our purpose and visibility checks, matching what is inside #collect_readers. */
-    if (!include_by_purpose(imageable)) {
-      continue;
-    }
+    /* Note we allow undefined prims in case prototypes are defined as overs.
+     * If the prim is defined, we apply additional checks for inclusion. */
+    if (child_prim.IsDefined()) {
+      const pxr::UsdGeomImageable imageable = pxr::UsdGeomImageable(child_prim);
+      if (!imageable) {
+        continue;
+      }
 
-    if (!include_by_visibility(imageable)) {
-      continue;
+      /* We should only traverse through a hierarchy, and any potential instancers, if they would
+       * be included by our purpose and visibility checks, matching what is inside
+       * #collect_readers. */
+      if (!include_by_purpose(imageable)) {
+        continue;
+      }
+
+      if (!include_by_visibility(imageable)) {
+        continue;
+      }
     }
 
     if (pxr::UsdGeomPointInstancer instancer = pxr::UsdGeomPointInstancer(child_prim)) {