Server Error in '/' Application.

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Line 49:     {
Line 50:         var OGImageField = (Sitecore.Data.Fields.ImageField)Item.Fields["OG Image"];
Line 51:         var OGImageUrl = Sitecore.Resources.Media.MediaManager.GetMediaUrl(OGImageField.MediaItem) != null ? Sitecore.Resources.Media.MediaManager.GetMediaUrl(OGImageField.MediaItem) : null;
Line 52:         <meta property="og:image" content="@OHG.Foundation.Extension.Extensions.StringExtensions.Canonical(OGImageUrl)" />
Line 53:     }

[ArgumentNullException: Value cannot be null.
Parameter name: item]
   Sitecore.Diagnostics.Assert.ArgumentNotNull(Object argument, String argumentName) +64
   Sitecore.Resources.Media.MediaProvider.GetMediaUrl(MediaItem item) +34
   ASP._Page_Views_Project_Amari_Layout_Master_cshtml.Execute() in c:\home\site\wwwroot\Views\Project\Amari\Layout\Master.cshtml:51
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +252
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +148
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +122
   System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) +136
   Sitecore.Mvc.Presentation.ViewRenderer.Render(TextWriter writer) +263

[InvalidOperationException: Error while rendering view: '/Views/Project/Amari/Layout/Master.cshtml' (model: 'Sitecore.Mvc.Presentation.RenderingModel, Sitecore.Mvc').
]
   Sitecore.Mvc.Presentation.ViewRenderer.Render(TextWriter writer) +735
   Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer.Render(Renderer renderer, TextWriter writer, RenderRenderingArgs args) +147
   Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer.Process(RenderRenderingArgs args) +74
   (Object , Object ) +14
   Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) +1268
   Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain, Boolean failIfNotExists) +236
   Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain) +22
   Sitecore.Mvc.Pipelines.PipelineService.RunPipeline(String pipelineName, TArgs args) +195
   Sitecore.Mvc.Presentation.RenderingView.Render(ViewContext viewContext, TextWriter writer) +297
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +378
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +91
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +795
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +795
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +81
   System.Web.Mvc.Async.<>c__DisplayClass3_1.<BeginInvokeAction>b__5(IAsyncResult asyncResult) +39