diff --git a/Sources/XcodeProj/Objects/Files/PBXFileSystemSynchronizedBuildFileExceptionSet.swift b/Sources/XcodeProj/Objects/Files/PBXFileSystemSynchronizedBuildFileExceptionSet.swift
index 04923f3e5..d2f6336a2 100644
--- a/Sources/XcodeProj/Objects/Files/PBXFileSystemSynchronizedBuildFileExceptionSet.swift
+++ b/Sources/XcodeProj/Objects/Files/PBXFileSystemSynchronizedBuildFileExceptionSet.swift
@@ -62,7 +62,7 @@ public class PBXFileSystemSynchronizedBuildFileExceptionSet: PBXObject {
     // MARK: - Equatable
 
     override func isEqual(to object: Any?) -> Bool {
-        guard let rhs = object as? PBXFrameworksBuildPhase else { return false }
+        guard let rhs = object as? PBXFileSystemSynchronizedBuildFileExceptionSet else { return false }
         return isEqual(to: rhs)
     }
     
diff --git a/Sources/XcodeProj/Objects/Files/PBXFileSystemSynchronizedRootGroup.swift b/Sources/XcodeProj/Objects/Files/PBXFileSystemSynchronizedRootGroup.swift
index 0d8196837..23da01498 100644
--- a/Sources/XcodeProj/Objects/Files/PBXFileSystemSynchronizedRootGroup.swift
+++ b/Sources/XcodeProj/Objects/Files/PBXFileSystemSynchronizedRootGroup.swift
@@ -100,7 +100,7 @@ public class PBXFileSystemSynchronizedRootGroup: PBXFileElement {
     }
 
     override func isEqual(to object: Any?) -> Bool {
-        guard let rhs = object as? PBXFrameworksBuildPhase else { return false }
+        guard let rhs = object as? PBXFileSystemSynchronizedRootGroup else { return false }
         return isEqual(to: rhs)
     }
 }
diff --git a/Sources/XcodeProj/Objects/Targets/PBXTarget.swift b/Sources/XcodeProj/Objects/Targets/PBXTarget.swift
index 16c9c9f94..93f102283 100644
--- a/Sources/XcodeProj/Objects/Targets/PBXTarget.swift
+++ b/Sources/XcodeProj/Objects/Targets/PBXTarget.swift
@@ -181,9 +181,10 @@ public class PBXTarget: PBXContainerItem {
         packageProductDependencyReferences = packageProductDependencyReferenceStrings.map {
             objectReferenceRepository.getOrCreate(reference: $0, objects: objects)
         }
-        let fileSystemSynchronizedGroupsReferences: [String] = try container.decodeIfPresent(.fileSystemSynchronizedGroups) ?? []
-        self.fileSystemSynchronizedGroupsReferences = fileSystemSynchronizedGroupsReferences.map { objectReferenceRepository.getOrCreate(reference: $0, objects: objects) }
-
+        let fileSystemSynchronizedGroupsReferences: [String]? = try container.decodeIfPresent(.fileSystemSynchronizedGroups)
+        if let fileSystemSynchronizedGroupsReferences = fileSystemSynchronizedGroupsReferences {
+            self.fileSystemSynchronizedGroupsReferences = fileSystemSynchronizedGroupsReferences.map { objectReferenceRepository.getOrCreate(reference: $0, objects: objects) }
+        }
         productType = try container.decodeIfPresent(.productType)
         try super.init(from: decoder)
     }
diff --git a/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedBuildFileExceptionSet+Fixtures.swift b/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedBuildFileExceptionSet+Fixtures.swift
new file mode 100644
index 000000000..d49b85791
--- /dev/null
+++ b/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedBuildFileExceptionSet+Fixtures.swift
@@ -0,0 +1,13 @@
+import XcodeProj
+
+extension PBXFileSystemSynchronizedBuildFileExceptionSet {
+    static func fixture(target: PBXTarget = .fixture(),
+                        membershipExceptions: [String]? = [],
+                        publicHeaders: [String]? = [],
+                        privateHeaders: [String]? = []) -> PBXFileSystemSynchronizedBuildFileExceptionSet {
+        return PBXFileSystemSynchronizedBuildFileExceptionSet(target: target,
+                                                              membershipExceptions: membershipExceptions,
+                                                              publicHeaders: publicHeaders,
+                                                              privateHeaders: privateHeaders)
+    }
+}
diff --git a/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedBuildFileExceptionSetTests.swift b/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedBuildFileExceptionSetTests.swift
new file mode 100644
index 000000000..799edaee3
--- /dev/null
+++ b/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedBuildFileExceptionSetTests.swift
@@ -0,0 +1,29 @@
+import Foundation
+import XCTest
+@testable import XcodeProj
+
+final class PBXFileSystemSynchronizedBuildFileExceptionSetTests: XCTestCase {
+    var target: PBXTarget!
+    var subject: PBXFileSystemSynchronizedBuildFileExceptionSet!
+    
+    override func setUp() {
+        super.setUp()
+        target = PBXTarget.fixture()
+        subject = PBXFileSystemSynchronizedBuildFileExceptionSet.fixture(target: target)
+    }
+    
+    override func tearDown() {
+        target = nil
+        subject = nil
+        super.tearDown()
+    }
+    
+    func test_itHasTheCorrectIsa() {
+        XCTAssertEqual(PBXFileSystemSynchronizedBuildFileExceptionSet.isa, "PBXFileSystemSynchronizedBuildFileExceptionSet")
+    }
+    
+    func test_equal_returnsTheCorrectValue() {
+        let another = PBXFileSystemSynchronizedBuildFileExceptionSet.fixture(target: target)
+        XCTAssertEqual(subject, another)
+    }
+}
diff --git a/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedRootGroup+Fixtures.swift b/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedRootGroup+Fixtures.swift
new file mode 100644
index 000000000..7a14963af
--- /dev/null
+++ b/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedRootGroup+Fixtures.swift
@@ -0,0 +1,27 @@
+import XcodeProj
+
+extension PBXFileSystemSynchronizedRootGroup {
+    static func fixture(sourceTree: PBXSourceTree? = nil,
+                            path: String? = nil,
+                            name: String? = nil,
+                            includeInIndex: Bool? = nil,
+                            usesTabs: Bool? = nil,
+                            indentWidth: UInt? = nil,
+                            tabWidth: UInt? = nil,
+                            wrapsLines: Bool? = nil,
+                            explicitFileTypes: [String: String] = [:],
+                            exceptions: [PBXFileSystemSynchronizedBuildFileExceptionSet] = [],
+                        explicitFolders: [String] = []) -> PBXFileSystemSynchronizedRootGroup {
+        return PBXFileSystemSynchronizedRootGroup(sourceTree: sourceTree,
+                                                  path: path,
+                                                  name: name,
+                                                  includeInIndex: includeInIndex,
+                                                  usesTabs: usesTabs,
+                                                  indentWidth: indentWidth,
+                                                  tabWidth: tabWidth,
+                                                  wrapsLines: wrapsLines,
+                                                  explicitFileTypes: explicitFileTypes,
+                                                  exceptions: exceptions, 
+                                                  explicitFolders: explicitFolders)
+    }
+}
diff --git a/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedRootGroupTests.swift b/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedRootGroupTests.swift
new file mode 100644
index 000000000..21894e0e0
--- /dev/null
+++ b/Tests/XcodeProjTests/Objects/Files/PBXFileSystemSynchronizedRootGroupTests.swift
@@ -0,0 +1,51 @@
+import Foundation
+import XCTest
+@testable import XcodeProj
+
+final class PBXFileSystemSynchronizedRootGroupTests: XCTestCase {
+    var subject: PBXFileSystemSynchronizedRootGroup!
+    var target: PBXTarget!
+    var exception: PBXFileSystemSynchronizedBuildFileExceptionSet!
+    
+    override func setUp() {
+        super.setUp()
+        target = PBXTarget.fixture()
+        exception = PBXFileSystemSynchronizedBuildFileExceptionSet.fixture(target: target)
+        subject = PBXFileSystemSynchronizedRootGroup(sourceTree: .group,
+                                                     path: "synchronized",
+                                                     name: "synchronized",
+                                                     includeInIndex: true,
+                                                     usesTabs: true,
+                                                     indentWidth: 2,
+                                                     tabWidth: 2,
+                                                     wrapsLines: true,
+                                                     explicitFileTypes: ["Source.m": "sourcecode.c.objc"],
+                                                     exceptions: [exception],
+                                                     explicitFolders: [])
+    }
+    
+    override func tearDown() {
+        exception = nil
+        subject = nil
+        super.tearDown()
+    }
+    
+    func test_itHasTheCorrectIsa() {
+        XCTAssertEqual(PBXFileSystemSynchronizedRootGroup.isa, "PBXFileSystemSynchronizedRootGroup")
+    }
+    
+    func test_equal_returnsTheCorrectValue() {
+        let another = PBXFileSystemSynchronizedRootGroup(sourceTree: .group,
+                                                         path: "synchronized",
+                                                         name: "synchronized",
+                                                         includeInIndex: true,
+                                                         usesTabs: true,
+                                                         indentWidth: 2,
+                                                         tabWidth: 2,
+                                                         wrapsLines: true,
+                                                         explicitFileTypes: ["Source.m": "sourcecode.c.objc"],
+                                                         exceptions: [exception],
+                                                         explicitFolders: [])
+        XCTAssertEqual(subject, another)
+    }
+}