diff --git a/test/Core.Test/Platform/Installations/Commands/UpdateInstallationCommandTests.cs b/test/Core.Test/Platform/Installations/Commands/UpdateInstallationCommandTests.cs
index daa8e1b89..ec04ac711 100644
--- a/test/Core.Test/Platform/Installations/Commands/UpdateInstallationCommandTests.cs
+++ b/test/Core.Test/Platform/Installations/Commands/UpdateInstallationCommandTests.cs
@@ -9,6 +9,49 @@ namespace Bit.Core.Platform.Installations.Tests;
 [SutProviderCustomize]
 public class UpdateInstallationCommandTests
 {
+    [Theory]
+    [BitAutoData]
+    public async Task UpdateLastActivityDateAsync_WithDefaultGuid_ThrowsException(SutProvider<UpdateInstallationCommand> sutProvider)
+    {
+        // Arrange
+        var defaultGuid = default(Guid);
+
+        // Act & Assert
+        var exception = await Assert.ThrowsAsync<Exception>(
+            () => sutProvider.Sut.UpdateLastActivityDateAsync(defaultGuid));
+
+        Assert.Contains("invalid installation id", exception.Message);
+
+        await sutProvider
+            .GetDependency<IInstallationRepository>()
+            .DidNotReceive()
+            .UpsertAsync(Arg.Any<Installation>());
+    }
+
+    [Theory]
+    [BitAutoData]
+    public async Task UpdateLastActivityDateAsync_WithNonExistentInstallation_ThrowsException(
+        Guid installationId,
+        SutProvider<UpdateInstallationCommand> sutProvider)
+    {
+        // Arrange
+        sutProvider
+            .GetDependency<IGetInstallationQuery>()
+            .GetByIdAsync(installationId)
+            .Returns((Installation)null);
+
+        // Act & Assert
+        var exception = await Assert.ThrowsAsync<Exception>(
+            () => sutProvider.Sut.UpdateLastActivityDateAsync(installationId));
+
+        Assert.Contains("no installation was found", exception.Message);
+
+        await sutProvider
+            .GetDependency<IInstallationRepository>()
+            .DidNotReceive()
+            .UpsertAsync(Arg.Any<Installation>());
+    }
+
     [Theory]
     [BitAutoData]
     public async Task UpdateLastActivityDateAsync_ShouldUpdateLastActivityDate(