From 4ffa658faf48cdac070832fee929e128d67e2b52 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Sun, 31 May 2020 17:07:41 +0200
Subject: [PATCH] Don't segfault on empty multithreaded iterator result set

---
 src/ifcgeom/IfcGeomIteratorImplementation.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ifcgeom/IfcGeomIteratorImplementation.h b/src/ifcgeom/IfcGeomIteratorImplementation.h
index cfa5d5d42a..e656d9e706 100644
--- a/src/ifcgeom/IfcGeomIteratorImplementation.h
+++ b/src/ifcgeom/IfcGeomIteratorImplementation.h
@@ -376,6 +376,8 @@ namespace IfcGeom {
 			if (num_threads_ != 1) {
 				collect();
 				process_concurrently();
+
+				return all_processed_elements_.size();
 			} else {
 				if (!create()) {
 					return false;