From 2ddbc6e4821d81b1f724508de1d8804777dc8cd5 Mon Sep 17 00:00:00 2001
From: Markus Lampert <markus@bibi.ca>
Date: Mon, 9 Oct 2017 14:15:23 -0700
Subject: [PATCH] Fixed expression retrieval if no expression is set.

---
 src/Gui/QuantitySpinBox.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/Gui/QuantitySpinBox.cpp b/src/Gui/QuantitySpinBox.cpp
index 8cf3a9937c..19a20735d4 100644
--- a/src/Gui/QuantitySpinBox.cpp
+++ b/src/Gui/QuantitySpinBox.cpp
@@ -351,8 +351,13 @@ void QuantitySpinBox::setBoundToByName(const QString &name)
 QString Gui::QuantitySpinBox::expressionText() const
 {
     Q_D(const QuantitySpinBox);
-    if (isBound()) {
-        return QString::fromStdString(getExpressionString());
+    try {
+        if (hasExpression()) {
+            return QString::fromStdString(getExpressionString());
+        }
+    }
+    catch (const Base::Exception& e) {
+        qDebug() << e.what();
     }
     return QString();
 }