From c4dbe7e8662b142fe31169b72bb0945ad2f104e4 Mon Sep 17 00:00:00 2001
From: Kacper Donat <kadet1090@gmail.com>
Date: Mon, 13 Oct 2025 20:15:08 +0200
Subject: [PATCH] PartDesign: Fix boolean fuse without tools

This fixes issue where exception was thrown when no tools were selected
preventing the task dialog from being opened.
---
 src/Mod/PartDesign/App/FeatureBoolean.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Mod/PartDesign/App/FeatureBoolean.cpp b/src/Mod/PartDesign/App/FeatureBoolean.cpp
index abd0a106f5..252465cfd9 100644
--- a/src/Mod/PartDesign/App/FeatureBoolean.cpp
+++ b/src/Mod/PartDesign/App/FeatureBoolean.cpp
@@ -177,6 +177,12 @@ void Boolean::updatePreviewShape()
     }
 
     if (strcmp(Type.getValueAsString(), "Fuse") == 0) {
+        // if there are no other shapes to fuse just return itself
+        if (Group.getValues().empty()) {
+            PreviewShape.setValue(Shape.getShape());
+            return;
+        }
+
         std::vector<TopoShape> shapes;
 
         for (auto& obj : Group.getValues()) {