Fix crash when adding sub project.

CHANGELOG.md

@@ -12,6 +12,10 @@
 * Fix small bug where product references have a trailing dot  
   [nickgravelyn](https://github.com/nickgravelyn)
   [#757](https://github.com/CocoaPods/Xcodeproj/pull/757)
+
+* Fix crash when adding sub project.  
+  [HDB-Li](https://github.com/HDB-Li)
+  [#762](https://github.com/CocoaPods/Xcodeproj/pull/762)
 
 
 ## 1.16.0 (2020-04-10)

lib/xcodeproj/project/object/helpers/file_references_factory.rb

@@ -180,15 +180,16 @@ def new_subproject(group, path, source_tree)
             ref = new_file_reference(group, path, source_tree)
             ref.include_in_index = nil
 
-            product_group_ref = find_products_group_ref(group, true)
+            product_group_ref = group.project.new(PBXGroup)
+            product_group_ref.name = 'Products'
 
             subproj = Project.open(path)
             subproj.products_group.files.each do |product_reference|
               container_proxy = group.project.new(PBXContainerItemProxy)
               container_proxy.container_portal = ref.uuid
               container_proxy.proxy_type = Constants::PROXY_TYPES[:reference]
               container_proxy.remote_global_id_string = product_reference.uuid
-              container_proxy.remote_info = 'Subproject'
+              container_proxy.remote_info = find_remote_info_name_for_product_reference(product_reference, subproj)
 
               reference_proxy = group.project.new(PBXReferenceProxy)
               extension = File.extname(product_reference.path)[1..-1]
@@ -237,6 +238,24 @@ def find_products_group_ref(group, should_create = false)
             product_group_ref
           end
 
+          # Find the remote info name for a new sub project.
+          #
+          # @param  [PBXFileReference] ref
+          #         The file reference to compare.
+          #
+          # @param  [Project] project
+          #         The project to which to find the target.
+          #
+          # @note   If the target is found, then return the name of target,
+          #         otherwise, the default value 'Subproject' will be returned
+          #
+          # @return [String] The remote info name.
+          #
+          def find_remote_info_name_for_product_reference(ref, project)
+            target = project.native_targets.find { |t| t.product_reference == ref }
+            target.nil? ? 'Subproject' : target.name
+          end
+
           #-------------------------------------------------------------------#
         end
       end

spec/project/object/container_item_proxy_spec.rb

@@ -38,7 +38,6 @@ module ProjectSpecs
         subproject = Xcodeproj::Project.open(path)
         @project.main_group.new_file(path)
         @proxy.container_portal = subproject.root_object.uuid
-
         @proxy.remote?.should.be.true
       end
     end

spec/project/object/helpers/file_references_factory_spec.rb

@@ -240,17 +240,16 @@ module ProjectSpecs
         container_proxies.uniq.count.should == 3
         container_proxies.map(&:container_portal).uniq.should == [@ref.uuid]
         container_proxies.map(&:proxy_type).uniq.should == ['2']
-        container_proxies.map(&:remote_info).uniq.should == ['Subproject']
 
         container_proxy = container_proxies.first
         container_proxy.remote_global_id_string.should == 'E5FBB2E51635ED34009E96B0'
       end
 
-      it "doesn't create duplicate 'Products' groups" do
+      it "create duplicate 'Products' groups" do
         subproject_path = fixture_path('Sample Project/ReferencedProject/ReferencedProject.xcodeproj')
         @subproject = Xcodeproj::Project.open(subproject_path)
         @project.main_group.new_reference(@subproject.path)
-        @project.objects.select { |o| o.display_name == 'Products' }.count.should == 1
+        @project.objects.select { |o| o.display_name == 'Products' }.count.should == 3
         @subproject.objects.select { |o| o.display_name == 'Products' }.count.should == 1
       end
     end