From 52ef3a5d19eda1c9641be1248d4fb8d0fd6578ac Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Wed, 13 Sep 2017 18:42:33 +0200
Subject: [PATCH] avoid permanently throwing exception by attach engine

---
 src/Mod/Part/App/AttachExtension.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Part/App/AttachExtension.cpp b/src/Mod/Part/App/AttachExtension.cpp
index 96106864a4..1ec8d5a360 100644
--- a/src/Mod/Part/App/AttachExtension.cpp
+++ b/src/Mod/Part/App/AttachExtension.cpp
@@ -118,7 +118,9 @@ bool AttachExtension::positionBySupport()
     if (!_attacher)
         throw Base::RuntimeError("AttachExtension: can't positionBySupport, because no AttachEngine is set.");
     updateAttacherVals();
-    try{
+    try {
+        if (_attacher->mapMode == mmDeactivated)
+            return false;
         getPlacement().setValue(_attacher->calculateAttachedPlacement(getPlacement().getValue()));
         return true;
     } catch (ExceptionCancel) {