diff --git a/SafeExamBrowser.Lockdown.UnitTests/FeatureConfigurationBackupTests.cs b/SafeExamBrowser.Lockdown.UnitTests/FeatureConfigurationBackupTests.cs
index 82401564..bdb0a049 100644
--- a/SafeExamBrowser.Lockdown.UnitTests/FeatureConfigurationBackupTests.cs
+++ b/SafeExamBrowser.Lockdown.UnitTests/FeatureConfigurationBackupTests.cs
@@ -70,6 +70,20 @@ namespace SafeExamBrowser.Lockdown.UnitTests
 			Assert.IsFalse(File.Exists(filePath));
 		}
 
+		[TestMethod]
+		public void Delete_MustNotFailIfDataNotInBackup()
+		{
+			var configuration = new FeatureConfigurationStub();
+
+			sut.Delete(configuration);
+
+			sut.Save(new FeatureConfigurationStub());
+			sut.Save(new FeatureConfigurationStub());
+			sut.Save(new FeatureConfigurationStub());
+
+			sut.Delete(configuration);
+		}
+
 		[TestMethod]
 		public void GetAll_MustReturnAllConfigurationData()
 		{