diff --git a/DBClient.podspec b/DBClient.podspec
index c44954b..38bdc3e 100644
--- a/DBClient.podspec
+++ b/DBClient.podspec
@@ -29,7 +29,7 @@ Pod::Spec.new do |s|
   s.subspec "Realm" do  |spec|
   	spec.dependency "DBClient/Core"
     spec.source_files = ['DBClient/Realm/*.swift']
-    spec.dependency "RealmSwift", "~> 2.1.1"
+    spec.dependency "RealmSwift", "~> 2.8.1"
   end
 
 end
\ No newline at end of file
diff --git a/DBClient/CoreData/CoreDataObservable.swift b/DBClient/CoreData/CoreDataObservable.swift
index 2b1ff58..4014e07 100644
--- a/DBClient/CoreData/CoreDataObservable.swift
+++ b/DBClient/CoreData/CoreDataObservable.swift
@@ -112,7 +112,9 @@ private class FetchedResultsControllerDelegate<T: NSManagedObject>: NSObject, NS
     let inserted = batchChanges.filter { $0.isInsertion }.map { (index: $0.index(), element: $0.object()) }
     let updated = batchChanges.filter { $0.isUpdate }.map { (index: $0.index(), element: $0.object()) }
     
-    observer?(.change(objects: controller.fetchedObjects as? [T] ?? [], deletions: deleted, insertions: inserted, modifications: updated))
+    if let observer = observer {
+      observer(.change(objects: controller.fetchedObjects as? [T] ?? [], deletions: deleted, insertions: inserted, modifications: updated))
+    }
     batchChanges = []
   }
   
diff --git a/Example/Example.xcodeproj/project.pbxproj b/Example/Example.xcodeproj/project.pbxproj
index 99faf38..64fe0c4 100644
--- a/Example/Example.xcodeproj/project.pbxproj
+++ b/Example/Example.xcodeproj/project.pbxproj
@@ -151,7 +151,6 @@
 				C53372531E26155D004ECBCF /* Frameworks */,
 				C53372541E26155D004ECBCF /* Resources */,
 				5DD0265501157C9DFB18D487 /* [CP] Embed Pods Frameworks */,
-				3E7D40D093AC662DD66ED84E /* [CP] Copy Pods Resources */,
 			);
 			buildRules = (
 			);
@@ -210,30 +209,24 @@
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXShellScriptBuildPhase section */
-		3E7D40D093AC662DD66ED84E /* [CP] Copy Pods Resources */ = {
-			isa = PBXShellScriptBuildPhase;
-			buildActionMask = 2147483647;
-			files = (
-			);
-			inputPaths = (
-			);
-			name = "[CP] Copy Pods Resources";
-			outputPaths = (
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-			shellPath = /bin/sh;
-			shellScript = "\"${SRCROOT}/Pods/Target Support Files/Pods-Example/Pods-Example-resources.sh\"\n";
-			showEnvVarsInLog = 0;
-		};
 		5DD0265501157C9DFB18D487 /* [CP] Embed Pods Frameworks */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
 			);
 			inputPaths = (
+				"${SRCROOT}/Pods/Target Support Files/Pods-Example/Pods-Example-frameworks.sh",
+				"${BUILT_PRODUCTS_DIR}/Bolts-Swift/BoltsSwift.framework",
+				"${BUILT_PRODUCTS_DIR}/DBClient/DBClient.framework",
+				"${BUILT_PRODUCTS_DIR}/Realm/Realm.framework",
+				"${BUILT_PRODUCTS_DIR}/RealmSwift/RealmSwift.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";
 			outputPaths = (
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/BoltsSwift.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/DBClient.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Realm.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/RealmSwift.framework",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
@@ -246,13 +239,16 @@
 			files = (
 			);
 			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
 			);
 			name = "[CP] Check Pods Manifest.lock";
 			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-Example-checkManifestLockResult.txt",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "diff \"${PODS_ROOT}/../Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n";
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
 			showEnvVarsInLog = 0;
 		};
 /* End PBXShellScriptBuildPhase section */
diff --git a/Example/Podfile.lock b/Example/Podfile.lock
index 404cdb4..546f43f 100644
--- a/Example/Podfile.lock
+++ b/Example/Podfile.lock
@@ -6,27 +6,33 @@ PODS:
     - DBClient/Core
   - DBClient/Realm (0.1):
     - DBClient/Core
-    - RealmSwift (~> 2.1.1)
-  - Realm (2.1.2):
-    - Realm/Headers (= 2.1.2)
-  - Realm/Headers (2.1.2)
-  - RealmSwift (2.1.2):
-    - Realm (= 2.1.2)
+    - RealmSwift (~> 2.8.1)
+  - Realm (2.8.3):
+    - Realm/Headers (= 2.8.3)
+  - Realm/Headers (2.8.3)
+  - RealmSwift (2.8.3):
+    - Realm (= 2.8.3)
 
 DEPENDENCIES:
   - DBClient/CoreData (from `../`)
   - DBClient/Realm (from `../`)
 
+SPEC REPOS:
+  https://github.com/CocoaPods/Specs.git:
+    - Bolts-Swift
+    - Realm
+    - RealmSwift
+
 EXTERNAL SOURCES:
   DBClient:
-    :path: ../
+    :path: "../"
 
 SPEC CHECKSUMS:
   Bolts-Swift: fa98d1b59fc1acea9b21a21306dcdca1c85e3737
-  DBClient: fcf29df338854a8509d00cad7356ab3190be4006
-  Realm: efe855f4d977c8ce5a82d3116d9f1ff155a6550c
-  RealmSwift: 17d6ee30b6f9df86364408c2197492e33bfea567
+  DBClient: 464c0e9e1c858564657ce8c72ef80409c3b5e79d
+  Realm: 3601ef091c8c499a31101d8563b991e75546cdce
+  RealmSwift: 8183818515471b01a99abdd2970f8e4fd52b6f4a
 
 PODFILE CHECKSUM: 179eda0e5897e0216cdd26b5cd14adae089b4671
 
-COCOAPODS: 1.2.0
+COCOAPODS: 1.5.0