Index: Core/Components/src/Core.Components.DotSpatial.Forms/MapControl.cs
===================================================================
diff -u -r5047fad63b41f7f79bc8a1690fc69045e7233666 -ra53a95e1f5f86ce62a66dbca8b71983096c7b766
--- Core/Components/src/Core.Components.DotSpatial.Forms/MapControl.cs	(.../MapControl.cs)	(revision 5047fad63b41f7f79bc8a1690fc69045e7233666)
+++ Core/Components/src/Core.Components.DotSpatial.Forms/MapControl.cs	(.../MapControl.cs)	(revision a53a95e1f5f86ce62a66dbca8b71983096c7b766)
@@ -86,7 +86,10 @@
         public void ZoomToAllVisibleLayers()
         {
             IEnvelope envelope = CreateEnvelopeForAllVisibleLayers();
-            map.ViewExtents = envelope.ToExtent();
+            if (!envelope.IsNull)
+            {
+                map.ViewExtents = envelope.ToExtent();
+            }
         }
 
         public void TogglePanning()
Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/Probabilistics/IDistribution.cs
===================================================================
diff -u -r4512af7782ee31b36941bb280b54d9da2953dd71 -ra53a95e1f5f86ce62a66dbca8b71983096c7b766
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/Probabilistics/IDistribution.cs	(.../IDistribution.cs)	(revision 4512af7782ee31b36941bb280b54d9da2953dd71)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/Probabilistics/IDistribution.cs	(.../IDistribution.cs)	(revision a53a95e1f5f86ce62a66dbca8b71983096c7b766)
@@ -36,7 +36,7 @@
         /// <summary>
         /// Gets or sets the standard deviation (square root of the Var(X)) of the distribution.
         /// </summary>
-        /// <exception cref="ArgumentOutOfRangeException">Standard deviation is less then or equal to 0.</exception>
+        /// <exception cref="ArgumentOutOfRangeException">Standard deviation is less than 0.</exception>
         double StandardDeviation { get; set; }
     }
 }
\ No newline at end of file
Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/Probabilistics/LognormalDistribution.cs
===================================================================
diff -u -r4512af7782ee31b36941bb280b54d9da2953dd71 -ra53a95e1f5f86ce62a66dbca8b71983096c7b766
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/Probabilistics/LognormalDistribution.cs	(.../LognormalDistribution.cs)	(revision 4512af7782ee31b36941bb280b54d9da2953dd71)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/Probabilistics/LognormalDistribution.cs	(.../LognormalDistribution.cs)	(revision a53a95e1f5f86ce62a66dbca8b71983096c7b766)
@@ -72,9 +72,9 @@
             }
             set
             {
-                if (value <= 0)
+                if (value < 0)
                 {
-                    throw new ArgumentOutOfRangeException("value", Resources.StandardDeviation_Should_be_greater_than_zero);
+                    throw new ArgumentOutOfRangeException("value", Resources.StandardDeviation_Should_be_greater_than_or_equal_to_zero);
                 }
                 standardDeviation = value;
             }
Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/Probabilistics/NormalDistribution.cs
===================================================================
diff -u -r4512af7782ee31b36941bb280b54d9da2953dd71 -ra53a95e1f5f86ce62a66dbca8b71983096c7b766
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/Probabilistics/NormalDistribution.cs	(.../NormalDistribution.cs)	(revision 4512af7782ee31b36941bb280b54d9da2953dd71)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/Probabilistics/NormalDistribution.cs	(.../NormalDistribution.cs)	(revision a53a95e1f5f86ce62a66dbca8b71983096c7b766)
@@ -52,9 +52,9 @@
             }
             set
             {
-                if (value <= 0)
+                if (value < 0)
                 {
-                    throw new ArgumentOutOfRangeException("value", Resources.StandardDeviation_Should_be_greater_than_zero);
+                    throw new ArgumentOutOfRangeException("value", Resources.StandardDeviation_Should_be_greater_than_or_equal_to_zero);
                 }
                 standardDeviation = value;
             }
Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/Properties/Resources.Designer.cs
===================================================================
diff -u -r0c2ba533bc2cf8f4693c468e07f73737e2cc6644 -ra53a95e1f5f86ce62a66dbca8b71983096c7b766
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision 0c2ba533bc2cf8f4693c468e07f73737e2cc6644)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/Properties/Resources.Designer.cs	(.../Resources.Designer.cs)	(revision a53a95e1f5f86ce62a66dbca8b71983096c7b766)
@@ -1,7 +1,7 @@
 //------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by a tool.
-//     Runtime Version:4.0.30319.34209
+//     Runtime Version:4.0.30319.18444
 //
 //     Changes to this file may cause incorrect behavior and will be lost if
 //     the code is regenerated.
@@ -306,11 +306,11 @@
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Standaard afwijking (σ) moet groter zijn dan 0..
+        ///   Looks up a localized string similar to Standaard afwijking (σ) moet groter zijn dan of gelijk zijn aan 0..
         /// </summary>
-        public static string StandardDeviation_Should_be_greater_than_zero {
+        public static string StandardDeviation_Should_be_greater_than_or_equal_to_zero {
             get {
-                return ResourceManager.GetString("StandardDeviation_Should_be_greater_than_zero", resourceCulture);
+                return ResourceManager.GetString("StandardDeviation_Should_be_greater_than_or_equal_to_zero", resourceCulture);
             }
         }
     }
Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/Properties/Resources.resx
===================================================================
diff -u -r0c2ba533bc2cf8f4693c468e07f73737e2cc6644 -ra53a95e1f5f86ce62a66dbca8b71983096c7b766
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/Properties/Resources.resx	(.../Resources.resx)	(revision 0c2ba533bc2cf8f4693c468e07f73737e2cc6644)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/Properties/Resources.resx	(.../Resources.resx)	(revision a53a95e1f5f86ce62a66dbca8b71983096c7b766)
@@ -120,8 +120,8 @@
   <data name="Error_Cannot_Construct_PipingSoilProfile_Without_Layers" xml:space="preserve">
     <value>Geen lagen gevonden voor het profiel.</value>
   </data>
-  <data name="StandardDeviation_Should_be_greater_than_zero" xml:space="preserve">
-    <value>Standaard afwijking (σ) moet groter zijn dan 0.</value>
+  <data name="StandardDeviation_Should_be_greater_than_or_equal_to_zero" xml:space="preserve">
+    <value>Standaard afwijking (σ) moet groter zijn dan of gelijk zijn aan 0.</value>
   </data>
   <data name="DesignVariable_Percentile_must_be_in_range" xml:space="preserve">
     <value>Percentiel moet in het bereik van [0, 1] vallen.</value>
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/Probabilistics/LognormalDistributionTest.cs
===================================================================
diff -u -r394db7c1bd905eb7444b9b2c47bcb5111bb63af6 -ra53a95e1f5f86ce62a66dbca8b71983096c7b766
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/Probabilistics/LognormalDistributionTest.cs	(.../LognormalDistributionTest.cs)	(revision 394db7c1bd905eb7444b9b2c47bcb5111bb63af6)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/Probabilistics/LognormalDistributionTest.cs	(.../LognormalDistributionTest.cs)	(revision a53a95e1f5f86ce62a66dbca8b71983096c7b766)
@@ -54,7 +54,7 @@
         }
 
         [Test]
-        [TestCase(0)]
+        [TestCase(0 - 1e-6)]
         [TestCase(-4)]
         public void StandardDeviation_SettingNotGreaterThan0_ThrowArgumentOutOfRangeException(double newStd)
         {
@@ -67,7 +67,7 @@
             // Assert
             ArgumentException exception = Assert.Throws<ArgumentOutOfRangeException>(call);
             string customMessagePart = exception.Message.Split(new []{Environment.NewLine}, StringSplitOptions.None)[0];
-            Assert.AreEqual("Standaard afwijking (\u03C3) moet groter zijn dan 0.", customMessagePart);
+            Assert.AreEqual("Standaard afwijking (\u03C3) moet groter zijn dan of gelijk zijn aan 0.", customMessagePart);
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/Probabilistics/NormalDistributionTest.cs
===================================================================
diff -u -r394db7c1bd905eb7444b9b2c47bcb5111bb63af6 -ra53a95e1f5f86ce62a66dbca8b71983096c7b766
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/Probabilistics/NormalDistributionTest.cs	(.../NormalDistributionTest.cs)	(revision 394db7c1bd905eb7444b9b2c47bcb5111bb63af6)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/Probabilistics/NormalDistributionTest.cs	(.../NormalDistributionTest.cs)	(revision a53a95e1f5f86ce62a66dbca8b71983096c7b766)
@@ -22,7 +22,7 @@
         }
 
         [Test]
-        [TestCase(0)]
+        [TestCase(0 - 1e-6)]
         [TestCase(-4)]
         public void StandardDeviation_SettingNotGreaterThan0_ThrowArgumentOutOfRangeException(double newStd)
         {
@@ -35,7 +35,7 @@
             // Assert
             ArgumentException exception = Assert.Throws<ArgumentOutOfRangeException>(call);
             string customMessagePart = exception.Message.Split(new []{Environment.NewLine}, StringSplitOptions.None)[0];
-            Assert.AreEqual("Standaard afwijking (\u03C3) moet groter zijn dan 0.", customMessagePart);
+            Assert.AreEqual("Standaard afwijking (\u03C3) moet groter zijn dan of gelijk zijn aan 0.", customMessagePart);
         }
     }
 }
\ No newline at end of file