diff --git a/.gitignore b/.gitignore
index 7d6aff2..2db0cc6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 ## Build generated
 build/
 DerivedData/
+Packages/
 
 ## Various settings
 *.pbxuser
diff --git a/TPInAppReceipt.podspec b/TPInAppReceipt.podspec
index 674e49d..d436dc3 100644
--- a/TPInAppReceipt.podspec
+++ b/TPInAppReceipt.podspec
@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
 
 s.name         = "TPInAppReceipt"
-s.version      = "1.1.3"
+s.version      = "1.1.4"
 s.summary      = "Validates and parses Apple Store Receipt."
 
 s.description  = "This helper validates and parses the payload and the PKCS7 container itself. Pure swift, openssl+bitcode"
diff --git a/TPInAppReceipt/Info.plist b/TPInAppReceipt/Info.plist
index fbe1e6b..76bf6f7 100644
--- a/TPInAppReceipt/Info.plist
+++ b/TPInAppReceipt/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
+	<string>1.1.4</string>
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>NSPrincipalClass</key>
diff --git a/TPInAppReceipt/Source/DeviceGUIDRetriever.swift b/TPInAppReceipt/Source/DeviceGUIDRetriever.swift
index b96bdf4..73aa26f 100644
--- a/TPInAppReceipt/Source/DeviceGUIDRetriever.swift
+++ b/TPInAppReceipt/Source/DeviceGUIDRetriever.swift
@@ -42,8 +42,8 @@ class DeviceGUIDRetriever
                 assertionFailure("Failed to retrieve guid")
             }
             
-            // Iterate over the result
-            var guidCFData: CFData!
+ // Iterate over the result
+            var guidData: Data!
             var service = IOIteratorNext(iterator)
             var parentService = io_object_t()
             
@@ -51,23 +51,33 @@ class DeviceGUIDRetriever
             {
                 IOObjectRelease(iterator)
             }
+            
             while(service != 0)
             {
-                kernResult = IORegistryEntryGetParentEntry(service, kIOServicePlane, &parentService);
+                kernResult = IORegistryEntryGetParentEntry(service, kIOServicePlane, &parentService)
+                
                 if (kernResult == KERN_SUCCESS)
                 {
-                    guidCFData = IORegistryEntryCreateCFProperty(parentService, "IOMACAddress" as CFString, nil, 0) as! CFData?
+                    guidData = IORegistryEntryCreateCFProperty(parentService, "IOMACAddress" as CFString, nil, 0).takeRetainedValue() as! Data
+                    
                     IOObjectRelease(parentService)
                 }
                 IOObjectRelease(service)
                 
-                if let _ = guidCFData
-                {
+                if  guidData != nil {
                     break
+                }else{
+                    service = IOIteratorNext(iterator)
                 }
             }
             
-            return guidCFData as Data
+            if guidData == nil
+            {
+                assertionFailure("Failed to retrieve guid")
+            }
+            
+            return guidData
+
         #endif
     }
 }