Fix NRE (#657)

kronic · web-flow · commit 6bd466f9c83b · 2024-05-10T19:42:36.000+01:00
diff --git a/src/ReactiveUI.Validation/Extensions/ValidatableViewModelExtensions.cs b/src/ReactiveUI.Validation/Extensions/ValidatableViewModelExtensions.cs
@@ -533,7 +533,7 @@ private static ValidationHelper RegisterValidation<TValidationComponent>(
         viewModel.ValidationContext.Add(validation);
         return new ValidationHelper(validation, Disposable.Create(() =>
         {
-            viewModel.ValidationContext.Remove(validation);
+            viewModel.ValidationContext?.Remove(validation);
             validation.Dispose();
         }));
     }

Original file line number	Diff line number	Diff line change
`@@ -533,7 +533,7 @@ private static ValidationHelper RegisterValidation<TValidationComponent>(`
`533`	`533`	`viewModel.ValidationContext.Add(validation);`
`534`	`534`	`return new ValidationHelper(validation, Disposable.Create(() =>`
`535`	`535`	`{`
`536`		`- viewModel.ValidationContext.Remove(validation);`
	`536`	`+ viewModel.ValidationContext?.Remove(validation);`
`537`	`537`	`validation.Dispose();`
`538`	`538`	`}));`
`539`	`539`	`}`