Index: Riskeer/Common/src/Riskeer.Common.Forms/TypeConverters/NoValueDoubleConverter.cs
===================================================================
diff -u -r00f1aeb03b58ee1e86805ce9280cb3baef8b9e40 -r6f7079fb3e810b6e9eb9cf50f3ee8edc48e2e9b5
--- Riskeer/Common/src/Riskeer.Common.Forms/TypeConverters/NoValueDoubleConverter.cs	(.../NoValueDoubleConverter.cs)	(revision 00f1aeb03b58ee1e86805ce9280cb3baef8b9e40)
+++ Riskeer/Common/src/Riskeer.Common.Forms/TypeConverters/NoValueDoubleConverter.cs	(.../NoValueDoubleConverter.cs)	(revision 6f7079fb3e810b6e9eb9cf50f3ee8edc48e2e9b5)
@@ -31,6 +31,11 @@
     /// </summary>
     public class NoValueDoubleConverter : TypeConverter
     {
+        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
+        {
+            return sourceType == typeof(string) || base.CanConvertFrom(context, sourceType);
+        }
+
         public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
         {
             if (value is string text)
Index: Riskeer/Common/test/Riskeer.Common.Forms.Test/TypeConverters/NoValueDoubleConverterTest.cs
===================================================================
diff -u -r00f1aeb03b58ee1e86805ce9280cb3baef8b9e40 -r6f7079fb3e810b6e9eb9cf50f3ee8edc48e2e9b5
--- Riskeer/Common/test/Riskeer.Common.Forms.Test/TypeConverters/NoValueDoubleConverterTest.cs	(.../NoValueDoubleConverterTest.cs)	(revision 00f1aeb03b58ee1e86805ce9280cb3baef8b9e40)
+++ Riskeer/Common/test/Riskeer.Common.Forms.Test/TypeConverters/NoValueDoubleConverterTest.cs	(.../NoValueDoubleConverterTest.cs)	(revision 6f7079fb3e810b6e9eb9cf50f3ee8edc48e2e9b5)
@@ -42,6 +42,32 @@
         }
 
         [Test]
+        public void CanConvertFrom_String_ReturnTrue()
+        {
+            // Setup
+            var converter = new NoValueDoubleConverter();
+
+            // Call
+            bool canConvertFromString = converter.CanConvertFrom(typeof(string));
+
+            // Assert
+            Assert.IsTrue(canConvertFromString);
+        }
+
+        [Test]
+        public void CanConvertFrom_OtherThanString_ReturnFalse()
+        {
+            // Setup
+            var converter = new NoValueDoubleConverter();
+
+            // Call
+            bool canConvertFromString = converter.CanConvertFrom(typeof(object));
+
+            // Assert
+            Assert.IsFalse(canConvertFromString);
+        }
+
+        [Test]
         [TestCase("")]
         [TestCase("     ")]
         [TestCase("-")]