Null check on FallbackValidator

Author: seankearney

src/Kernel/Validators/FallbackValidator.cs

@@ -1,38 +1,38 @@
-using FieldFallback.Data;
-using Sitecore.Data.Fields;
-using Sitecore.Data.Validators;
-
-namespace FieldFallback.Validators
-{
-   public class FallbackValidator : StandardValidator
-   {
-      protected override ValidatorResult Evaluate()
-      {
-         Field field = GetField();
-
-         if(field != null)
-         {
-            if (FallbackValuesManager.Provider.FieldContainsFallbackValue(field, ItemUri.Language))
-            {
-               Text = GetText("Field \"{0}\" contains a fallback value", new[] { GetFieldDisplayName() });
-               return GetFailedResult(ValidatorResult.Warning);
-            }
-         }
-
-         return ValidatorResult.Valid;
-      }
-
-      protected override ValidatorResult GetMaxValidatorResult()
-      {
-         return GetFailedResult(ValidatorResult.Warning);
-      }
-
-      public override string Name
-      {
-         get
-         {
-            return "Fallback";
-         }
-      }
-   }
-}
+using FieldFallback.Data;
+using Sitecore.Data.Fields;
+using Sitecore.Data.Validators;
+
+namespace FieldFallback.Validators
+{
+   public class FallbackValidator : StandardValidator
+   {
+      protected override ValidatorResult Evaluate()
+      {
+         Field field = GetField();
+
+         if (field != null && FallbackValuesManager.Provider != null)
+         {
+            if (FallbackValuesManager.Provider.FieldContainsFallbackValue(field, ItemUri.Language))
+            {
+               Text = GetText("Field \"{0}\" contains a fallback value", new[] { GetFieldDisplayName() });
+               return GetFailedResult(ValidatorResult.Warning);
+            }
+         }
+
+         return ValidatorResult.Valid;
+      }
+
+      protected override ValidatorResult GetMaxValidatorResult()
+      {
+         return GetFailedResult(ValidatorResult.Warning);
+      }
+
+      public override string Name
+      {
+         get
+         {
+            return "Fallback";
+         }
+      }
+   }
+}