diff --git a/ChangeLog.txt b/ChangeLog.txt
index 8fce60202..b13fd9bae 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -3,6 +3,7 @@
 - [#905] Valentina crashes with error: This id is not unique.
 - [#909] Valentina produces wrong united path.
 - [#912] Labels in inactive state return to initial color.
+- [#913] Unable to save changes for piece path if it doesn't contain a point.
 
 # Version 0.6.1 October 23, 2018
 - [#885] Regression. Broken support for multi size measurements.
diff --git a/src/libs/vtools/dialogs/tools/piece/dialogpiecepath.cpp b/src/libs/vtools/dialogs/tools/piece/dialogpiecepath.cpp
index 933bc129b..747e773b3 100644
--- a/src/libs/vtools/dialogs/tools/piece/dialogpiecepath.cpp
+++ b/src/libs/vtools/dialogs/tools/piece/dialogpiecepath.cpp
@@ -748,34 +748,52 @@ void DialogPiecePath::EvalWidth()
 void DialogPiecePath::EvalWidthBefore()
 {
     labelEditFormula = ui->labelEditBefore;
-    const QString postfix = UnitsToStr(qApp->patternUnit(), true);
-    QString formula = ui->plainTextEditFormulaWidthBefore->toPlainText();
-    Eval(formula, m_flagFormulaBefore, ui->labelResultBefore, postfix, false, true);
-
-    formula = GetFormulaSAWidthBefore();
-    if (formula != currentSeamAllowance)
+    if (ui->comboBoxNodes->count() > 0)
     {
-        ui->pushButtonDefBefore->setEnabled(true);
-    }
+        const QString postfix = UnitsToStr(qApp->patternUnit(), true);
+        QString formula = ui->plainTextEditFormulaWidthBefore->toPlainText();
+        Eval(formula, m_flagFormulaBefore, ui->labelResultBefore, postfix, false, true);
 
-    UpdateNodeSABefore(formula);
+        formula = GetFormulaSAWidthBefore();
+        if (formula != currentSeamAllowance)
+        {
+            ui->pushButtonDefBefore->setEnabled(true);
+        }
+
+        UpdateNodeSABefore(formula);
+    }
+    else
+    {
+        ChangeColor(labelEditFormula, okColor);
+        ui->labelResultBefore->setText(tr("<Empty>"));
+        m_flagFormulaBefore = true;
+    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------
 void DialogPiecePath::EvalWidthAfter()
 {
     labelEditFormula = ui->labelEditAfter;
-    const QString postfix = UnitsToStr(qApp->patternUnit(), true);
-    QString formula = ui->plainTextEditFormulaWidthAfter->toPlainText();
-    Eval(formula, m_flagFormulaAfter, ui->labelResultAfter, postfix, false, true);
-
-    formula = GetFormulaSAWidthAfter();
-    if (formula != currentSeamAllowance)
+    if (ui->comboBoxNodes->count() > 0)
     {
-        ui->pushButtonDefAfter->setEnabled(true);
-    }
+        const QString postfix = UnitsToStr(qApp->patternUnit(), true);
+        QString formula = ui->plainTextEditFormulaWidthAfter->toPlainText();
+        Eval(formula, m_flagFormulaAfter, ui->labelResultAfter, postfix, false, true);
 
-    UpdateNodeSAAfter(formula);
+        formula = GetFormulaSAWidthAfter();
+        if (formula != currentSeamAllowance)
+        {
+            ui->pushButtonDefAfter->setEnabled(true);
+        }
+
+        UpdateNodeSAAfter(formula);
+    }
+    else
+    {
+        ChangeColor(labelEditFormula, okColor);
+        ui->labelResultAfter->setText(tr("<Empty>"));
+        m_flagFormulaAfter = true;
+    }
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/libs/vtools/dialogs/tools/piece/dialogseamallowance.cpp b/src/libs/vtools/dialogs/tools/piece/dialogseamallowance.cpp
index c698a8b18..652900888 100644
--- a/src/libs/vtools/dialogs/tools/piece/dialogseamallowance.cpp
+++ b/src/libs/vtools/dialogs/tools/piece/dialogseamallowance.cpp
@@ -2079,13 +2079,22 @@ void DialogSeamAllowance::EvalWidthBefore()
     if (uiTabPaths->checkBoxSeams->isChecked())
     {
         labelEditFormula = uiTabPaths->labelEditBefore;
-        const QString postfix = UnitsToStr(qApp->patternUnit(), true);
-        const QString formula = uiTabPaths->plainTextEditFormulaWidthBefore->toPlainText();
-        Eval(formula, flagFormulaBefore, uiTabPaths->labelResultBefore, postfix, false, true);
+        if (uiTabPaths->comboBoxNodes->count() > 0)
+        {
+            const QString postfix = UnitsToStr(qApp->patternUnit(), true);
+            const QString formula = uiTabPaths->plainTextEditFormulaWidthBefore->toPlainText();
+            Eval(formula, flagFormulaBefore, uiTabPaths->labelResultBefore, postfix, false, true);
 
-        const QString formulaSABefore = GetFormulaFromUser(uiTabPaths->plainTextEditFormulaWidthBefore);
-        UpdateNodeSABefore(formulaSABefore);
-        EnableDefButton(uiTabPaths->pushButtonDefBefore, formulaSABefore);
+            const QString formulaSABefore = GetFormulaFromUser(uiTabPaths->plainTextEditFormulaWidthBefore);
+            UpdateNodeSABefore(formulaSABefore);
+            EnableDefButton(uiTabPaths->pushButtonDefBefore, formulaSABefore);
+        }
+        else
+        {
+            ChangeColor(labelEditFormula, okColor);
+            uiTabPaths->labelResultBefore->setText(tr("<Empty>"));
+            flagFormulaBefore = true;
+        }
     }
 }
 
@@ -2095,13 +2104,22 @@ void DialogSeamAllowance::EvalWidthAfter()
     if (uiTabPaths->checkBoxSeams->isChecked())
     {
         labelEditFormula = uiTabPaths->labelEditAfter;
-        const QString postfix = UnitsToStr(qApp->patternUnit(), true);
-        const QString formula = uiTabPaths->plainTextEditFormulaWidthAfter->toPlainText();
-        Eval(formula, flagFormulaAfter, uiTabPaths->labelResultAfter, postfix, false, true);
+        if (uiTabPaths->comboBoxNodes->count() > 0)
+        {
+            const QString postfix = UnitsToStr(qApp->patternUnit(), true);
+            const QString formula = uiTabPaths->plainTextEditFormulaWidthAfter->toPlainText();
+            Eval(formula, flagFormulaAfter, uiTabPaths->labelResultAfter, postfix, false, true);
 
-        const QString formulaSAAfter = GetFormulaFromUser(uiTabPaths->plainTextEditFormulaWidthAfter);
-        UpdateNodeSAAfter(formulaSAAfter);
-        EnableDefButton(uiTabPaths->pushButtonDefAfter, formulaSAAfter);
+            const QString formulaSAAfter = GetFormulaFromUser(uiTabPaths->plainTextEditFormulaWidthAfter);
+            UpdateNodeSAAfter(formulaSAAfter);
+            EnableDefButton(uiTabPaths->pushButtonDefAfter, formulaSAAfter);
+        }
+        else
+        {
+            ChangeColor(labelEditFormula, okColor);
+            uiTabPaths->labelResultAfter->setText(tr("<Empty>"));
+            flagFormulaAfter = true;
+        }
     }
 }