diff --git a/RootHelper/control b/RootHelper/control
index 4a82fb8..8799025 100644
--- a/RootHelper/control
+++ b/RootHelper/control
@@ -1,6 +1,6 @@
 Package: com.opa334.trollstoreroothelper
 Name: trollstoreroothelper
-Version: 1.2
+Version: 1.2.1
 Architecture: iphoneos-arm
 Description: An awesome tool of some sort!!
 Maintainer: opa334
diff --git a/RootHelper/main.m b/RootHelper/main.m
index 558d040..32e3f77 100644
--- a/RootHelper/main.m
+++ b/RootHelper/main.m
@@ -80,6 +80,20 @@ NSSet<NSString*>* appleURLSchemes(void)
 	return systemURLSchemes.copy;
 }
 
+NSSet<NSString*>* appleAppBundleIdentifiers(void)
+{
+	LSEnumerator* enumerator = [LSEnumerator enumeratorForApplicationProxiesWithOptions:0];
+	enumerator.predicate = [NSPredicate predicateWithFormat:@"bundleIdentifier BEGINSWITH 'com.apple'"];
+
+	NSMutableSet* systemAppIdentifiers = [NSMutableSet new];
+	LSApplicationProxy* proxy;
+	while(proxy = [enumerator nextObject])
+	{
+		[systemAppIdentifiers addObject:proxy.bundleIdentifier.lowercaseString];
+	}
+
+	return systemAppIdentifiers.copy;
+}
 
 NSDictionary* infoDictionaryForAppPath(NSString* appPath)
 {
@@ -583,8 +597,15 @@ int installApp(NSString* appPath, BOOL sign, BOOL force)
 
 	NSString* appId = appIdForAppPath(appPath);
 	if(!appId) return 176;
+	if([appleAppBundleIdentifiers() containsObject:appId.lowercaseString])
+	{
+		return 179;
+	}
 
-	applyPatchesToInfoDictionary(appPath);
+	if(![appId isEqualToString:@"com.opa334.TrollStore"])
+	{
+		applyPatchesToInfoDictionary(appPath);
+	}
 
 	if(sign)
 	{
@@ -875,6 +896,12 @@ int installIpa(NSString* ipaPath, BOOL force)
 		}
 	}
 	if(!tmpAppPath) return 167;
+
+	NSString* appId = appIdForAppPath(tmpAppPath);
+	if([appId.lowercaseString isEqualToString:@"com.opa334.trollstore"])
+	{
+		return 179;
+	}
 	
 	int ret = installApp(tmpAppPath, YES, force);
 	
diff --git a/RootHelper/uicache.m b/RootHelper/uicache.m
index f50e214..636148e 100644
--- a/RootHelper/uicache.m
+++ b/RootHelper/uicache.m
@@ -6,6 +6,7 @@
 
 // uicache on steroids
 
+extern NSSet<NSString*>* appleAppBundleIdentifiers(void);
 extern NSDictionary* dumpEntitlementsFromBinaryAtPath(NSString* binaryPath);
 
 NSDictionary* constructGroupsContainersForEntitlements(NSDictionary* entitlements, BOOL systemGroups)
@@ -108,6 +109,8 @@ void registerPath(char* cPath, int unregister)
 	NSDictionary* appInfoPlist = [NSDictionary dictionaryWithContentsOfFile:[path stringByAppendingPathComponent:@"Info.plist"]];
 	NSString* appBundleID = [appInfoPlist objectForKey:@"CFBundleIdentifier"];
 
+	if([appleAppBundleIdentifiers() containsObject:appBundleID.lowercaseString]) return;
+
 	if(appBundleID && !unregister)
 	{
 		MCMContainer* appContainer = [NSClassFromString(@"MCMAppDataContainer") containerWithIdentifier:appBundleID createIfNecessary:YES existed:nil error:nil];
diff --git a/TrollHelper/Resources/Info.plist b/TrollHelper/Resources/Info.plist
index 6fb1e96..2a6049b 100644
--- a/TrollHelper/Resources/Info.plist
+++ b/TrollHelper/Resources/Info.plist
@@ -52,7 +52,7 @@
 		<string>iPhoneOS</string>
 	</array>
 	<key>CFBundleVersion</key>
-	<string>1.2</string>
+	<string>1.2.1</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>UIDeviceFamily</key>
diff --git a/TrollHelper/control b/TrollHelper/control
index a0ac732..9faecfb 100644
--- a/TrollHelper/control
+++ b/TrollHelper/control
@@ -1,6 +1,6 @@
 Package: com.opa334.trollstorehelper
 Name: TrollStore Helper
-Version: 1.2
+Version: 1.2.1
 Architecture: iphoneos-arm
 Description: Helper utility to install and manage TrollStore!
 Maintainer: opa334
diff --git a/TrollStore/Resources/Info.plist b/TrollStore/Resources/Info.plist
index e1ab217..41602f5 100644
--- a/TrollStore/Resources/Info.plist
+++ b/TrollStore/Resources/Info.plist
@@ -50,7 +50,7 @@
 		<string>iPhoneOS</string>
 	</array>
 	<key>CFBundleVersion</key>
-	<string>1.2</string>
+	<string>1.2.1</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>UIDeviceFamily</key>
diff --git a/TrollStore/TSApplicationsManager.m b/TrollStore/TSApplicationsManager.m
index 652c051..eebc197 100644
--- a/TrollStore/TSApplicationsManager.m
+++ b/TrollStore/TSApplicationsManager.m
@@ -109,6 +109,9 @@
         case 178:
         errorDescription = @"Failed to copy app bundle.";
         break;
+        case 179:
+        errorDescription = @"The app you tried to install has the same identifier as a system app already installed on the device. The installation has been prevented to protect you from possible bootloops or other issues.";
+        break;
         // App detach errors
         /*case 184:
         errorDescription = @"Refusing to detach, the app is still signed with a fake root certificate. The detach option is only for when you have installed an App Store app on top of a TrollStore app.";
diff --git a/TrollStore/control b/TrollStore/control
index 8ea5828..0b07353 100644
--- a/TrollStore/control
+++ b/TrollStore/control
@@ -1,6 +1,6 @@
 Package: com.opa334.trollstore
 Name: TrollStore
-Version: 1.2
+Version: 1.2.1
 Architecture: iphoneos-arm
 Description: An awesome application!
 Maintainer: opa334