When opening any of the page in sitecore edit or preview mode the sitecore ribbon bar controls are not showing and instead its showing the below error (inside iframe only). the page components are getting loaded. This is happening specifically to a content author user and not for other content author users. please clarify whether there is any problem in users details.
Server Error in '/' Application.
Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.] Sitecore.ContentSearch.Client.Pipelines.Search.SearchContentSearchIndex.Process(SearchArgs args) +4314 (Object , Object[] ) +73 Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) +468 Sitecore.Search.XpathQuerySearcher.SelectItems(String query, Database database) +245 Sitecore.Data.Database.SelectItems(String query) +80 Sitecore.Shell.Applications.WebEdit.Commands.OpenMyItems.GetHeader(CommandContext context, String header) +178 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.FillParamsFromCommand(CommandContext commandContext, RibbonCommandParams ribbonCommandParams) +97 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.GetCommandParameters(Item controlItem, CommandContext commandContext) +78 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderSmallButton(HtmlTextWriter output, Item button, CommandContext commandContext) +77 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderButton(HtmlTextWriter output, Item button, CommandContext commandContext) +633 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderChunk(HtmlTextWriter output, Item chunk, CommandContext commandContext) +343 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderChunk(HtmlTextWriter output, Item chunk, CommandContext commandContext, Boolean isContextual, String id) +243 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderChunk(HtmlTextWriter output, Item chunk, CommandContext commandContext, Boolean isContextual) +160 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderChunks(HtmlTextWriter output, Item strip, CommandContext commandContext, Boolean isContextual) +419 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderStrips(HtmlTextWriter output, Item ribbon, Boolean isContextual, ListString visibleStripList) +1857 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.RenderStrips(HtmlTextWriter output, Item defaultRibbon, Item contextualRibbon, ListString visibleStripList) +161 Sitecore.Web.UI.WebControls.Ribbons.Ribbon.Render(HtmlTextWriter output) +746 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +78 Sitecore.Web.HtmlUtil.RenderControl(Control ctl) +79 Sitecore.Shell.Applications.WebEdit.WebEditRibbonForm.RenderRibbon(Item item) +684 Sitecore.Shell.Applications.WebEdit.WebEditRibbonForm.OnLoad(EventArgs e) +1172
[TargetInvocationException: Exception has been thrown by the target of an invocation.] System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0 System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +128 System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +142 Sitecore.Reflection.ReflectionUtil.InvokeMethod(MethodInfo method, Object[] parameters, Object obj) +89 Sitecore.Web.UI.Sheer.ClientPage.OnLoad(EventArgs e) +597 System.Web.UI.Control.LoadRecursive() +68 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3429.0
