I've installed ezSearch on a client's site. When I search for keyword "test" and "tes" I get a script error:

Error loading Partial View script (file: ~/Views/MacroPartials/ezSearch.cshtml)

With debugging on I get:

Error loading Partial View (file: ~/Views/MacroPartials/ezSearch.cshtml)
Object reference not set to an instance of an object.
  at ASP._Page_Views_MacroPartials_ezSearch_cshtml.<>c__DisplayClasse.<RenderContentResult>b__c(TextWriter __razor_helper_writer) in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\b4507dd2\31898cc7\App_Web_ezsearch.cshtml.d673bf47.kxhucdlz.0.cs:line 0
  at ASP._Page_Views_MacroPartials_ezSearch_cshtml.<>c__DisplayClassa.<RenderResults>b__9(TextWriter __razor_helper_writer) in c:\inetpub\wwwroot\staging-spf.brickwall.uk.com\Views\MacroPartials\ezSearch.cshtml:line 208
  at ASP._Page_Views_MacroPartials_ezSearch_cshtml.Execute() in c:\inetpub\wwwroot\staging-spf.brickwall.uk.com\Views\MacroPartials\ezSearch.cshtml:line 147
  at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
  at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
  at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
  at Umbraco.Web.Mvc.ControllerExtensions.RenderViewResultAsString(ControllerBase controller, ViewResultBase viewResult)
  at Umbraco.Web.Macros.PartialViewMacroEngine.Execute(MacroModel macro, INode currentPage)
  at umbraco.macro.LoadPartialViewMacro(MacroModel macro)
  at umbraco.macro.renderMacro(Hashtable pageElements, Int32 pageId)

Any ideas?