diff --git a/developer/src/tike/http/Keyman.Developer.System.HttpServer.App.pas b/developer/src/tike/http/Keyman.Developer.System.HttpServer.App.pas
index b438efc916b..c934fc4163a 100644
--- a/developer/src/tike/http/Keyman.Developer.System.HttpServer.App.pas
+++ b/developer/src/tike/http/Keyman.Developer.System.HttpServer.App.pas
@@ -45,6 +45,7 @@ implementation
   KeymanDeveloperOptions,
   Keyman.Developer.System.Project.Project,
   Keyman.Developer.System.Project.ProjectFile,
+  Keyman.Developer.System.Project.ProjectLoader,
   Keyman.Developer.System.Project.WelcomeRenderer,
   RedistFiles;
 
@@ -95,6 +96,7 @@ procedure TAppHttpResponder.RespondProject(doc: string; AContext: TIdContext;
   procedure RespondProjectFile;
   var
     path: string;
+    p: TProject;
   begin
     if ARequestInfo.Params.IndexOfName('path') < 0 then
     begin
@@ -113,12 +115,21 @@ procedure TAppHttpResponder.RespondProject(doc: string; AContext: TIdContext;
     end;
 
     // Transform the .kpj
-    with TProject.Create(ptUnknown, path, True) do
+    try
+      p := TProject.Create(ptUnknown, path, True);
+    except
+      on E:EProjectLoader do
+      begin
+        AResponseInfo.ResponseNo := 400;
+        AResponseInfo.ResponseText := 'Invalid project file: '+E.Message;
+        Exit;
+      end;
+    end;
     try
       AResponseInfo.ContentType := 'text/html; charset=UTF-8';
-      AResponseInfo.ContentText := Render;
+      AResponseInfo.ContentText := p.Render;
     finally
-      Free;
+      p.Free;
     end;
   end;
 
diff --git a/developer/src/tike/main/Keyman.Developer.System.ProjectOwningFile.pas b/developer/src/tike/main/Keyman.Developer.System.ProjectOwningFile.pas
index b13a79e396c..e130adcf7fc 100644
--- a/developer/src/tike/main/Keyman.Developer.System.ProjectOwningFile.pas
+++ b/developer/src/tike/main/Keyman.Developer.System.ProjectOwningFile.pas
@@ -9,7 +9,8 @@ implementation
 uses
   System.SysUtils,
 
-  Keyman.Developer.System.Project.ProjectFile;
+  Keyman.Developer.System.Project.ProjectFile,
+  Keyman.Developer.System.Project.ProjectLoader;
 
 function CheckOwnerProjectForFile(const project, filename: string): Boolean; forward;
 
@@ -71,7 +72,15 @@ function CheckOwnerProjectForFile(const project, filename: string): Boolean;
   if SameFileName(project, filename) then
     Exit(True);
 
-  p := TProject.Create(ptUnknown, project, True);
+  try
+    p := TProject.Create(ptUnknown, project, True);
+  except
+    on E:EProjectLoader do
+    begin
+      Result := False;
+      Exit;
+    end;
+  end;
   try
     Result := p.Files.IndexOfFileName(filename) >= 0;
   finally