diff --git a/Sources/KSCrashFilters/KSCrashReportFilterBasic.m b/Sources/KSCrashFilters/KSCrashReportFilterBasic.m
index e36f88eb0..7c50f6394 100644
--- a/Sources/KSCrashFilters/KSCrashReportFilterBasic.m
+++ b/Sources/KSCrashFilters/KSCrashReportFilterBasic.m
@@ -278,15 +278,14 @@ - (instancetype) initWithFiltersArray:(NSArray*) filters
                 [expandedFilters addObject:filter];
             }
         }
-        self.filters = expandedFilters;
+        self.filters = [expandedFilters copy];
     }
     return self;
 }
 
 - (void) addFilter:(id<KSCrashReportFilter>) filter
 {
-    NSMutableArray* mutableFilters = (NSMutableArray*)self.filters; // Shh! Don't tell anyone!
-    [mutableFilters insertObject:filter atIndex:0];
+    self.filters = [@[filter] arrayByAddingObjectsFromArray:self.filters];
 }
 
 - (void) filterReports:(NSArray*) reports
diff --git a/Sources/KSCrashInstallations/include/KSCrashInstallation.h b/Sources/KSCrashInstallations/include/KSCrashInstallation.h
index afc3241e6..eecb18363 100644
--- a/Sources/KSCrashInstallations/include/KSCrashInstallation.h
+++ b/Sources/KSCrashInstallations/include/KSCrashInstallation.h
@@ -62,7 +62,7 @@ NS_SWIFT_NAME(Installation)
  *       when using this method. The callback will be internally managed to ensure proper integration
  *       with the backend.
  */
-- (void) installWithConfiguration:(KSCrashConfiguration*) configuration;
+- (void) installWithConfiguration:(nullable KSCrashConfiguration*) configuration;
 
 /** Convenience method to call -[KSCrash sendAllReportsWithCompletion:].
  * This method will set the KSCrash sink and then send all outstanding reports.
diff --git a/Sources/KSCrashInstallations/include/KSCrashInstallationQuincyHockey.h b/Sources/KSCrashInstallations/include/KSCrashInstallationQuincyHockey.h
index e773d16b1..59519055b 100644
--- a/Sources/KSCrashInstallations/include/KSCrashInstallationQuincyHockey.h
+++ b/Sources/KSCrashInstallations/include/KSCrashInstallationQuincyHockey.h
@@ -85,10 +85,10 @@ NS_SWIFT_NAME(InstallationBaseQuincyHockey)
 // The above properties will be written to the user section report using the
 // following keys.
 
-@property(nonatomic,readwrite,copy) NSString* userIDKey;
-@property(nonatomic,readwrite,copy) NSString* userNameKey;
-@property(nonatomic,readwrite,copy) NSString* contactEmailKey;
-@property(nonatomic,readwrite,copy) NSString* crashDescriptionKey;
+@property(nonatomic,readwrite,copy,nullable) NSString* userIDKey;
+@property(nonatomic,readwrite,copy,nullable) NSString* userNameKey;
+@property(nonatomic,readwrite,copy,nullable) NSString* contactEmailKey;
+@property(nonatomic,readwrite,copy,nullable) NSString* crashDescriptionKey;
 
 /** Data stored under these keys will be appended to the description
  * (in JSON format) before sending to Quincy/Hockey.
diff --git a/Sources/KSCrashInstallations/include/KSCrashInstallationVictory.h b/Sources/KSCrashInstallations/include/KSCrashInstallationVictory.h
index 4f6b0fe6c..2c7dbf649 100644
--- a/Sources/KSCrashInstallations/include/KSCrashInstallationVictory.h
+++ b/Sources/KSCrashInstallations/include/KSCrashInstallationVictory.h
@@ -45,7 +45,7 @@ NS_SWIFT_NAME(InstallationVictory)
 /** The URL to connect to. */
 @property(nonatomic,readwrite,strong) NSURL* url;
 /** The user name of crash information *required*. If value is nil it will be replaced with UIDevice.currentDevice.name */
-@property(nonatomic,readwrite,copy) NSString* userName;
+@property(nonatomic,readwrite,copy,nullable) NSString* userName;
 /** The user email of crash information *optional* */
 @property(nonatomic,readwrite,copy,nullable) NSString* userEmail;
 
diff --git a/Tests/KSCrashInstallationsTests/KSCrashInstallationEmail_Tests.m b/Tests/KSCrashInstallationsTests/KSCrashInstallationEmail_Tests.m
index c87bcff9a..5c59ee0db 100644
--- a/Tests/KSCrashInstallationsTests/KSCrashInstallationEmail_Tests.m
+++ b/Tests/KSCrashInstallationsTests/KSCrashInstallationEmail_Tests.m
@@ -56,10 +56,13 @@ - (void) testInstall
 - (void) testInstallInvalid
 {
     KSCrashInstallationEmail* installation = [KSCrashInstallationEmail sharedInstance];
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wnonnull"
     installation.recipients = nil;
     installation.subject = nil;
     installation.message = nil;
     installation.filenameFmt = nil;
+#pragma clang diagnostic pop
     [installation addUnconditionalAlertWithTitle:@"title" message:@"message" dismissButtonText:@"dismiss"];
     [installation installWithConfiguration:nil];
     [installation sendAllReportsWithCompletion:^(__unused NSArray *filteredReports, BOOL completed, NSError *error)
diff --git a/Tests/KSCrashInstallationsTests/KSCrashInstallationQuincyHockey_Tests.m b/Tests/KSCrashInstallationsTests/KSCrashInstallationQuincyHockey_Tests.m
index c21e12e82..408afd598 100644
--- a/Tests/KSCrashInstallationsTests/KSCrashInstallationQuincyHockey_Tests.m
+++ b/Tests/KSCrashInstallationsTests/KSCrashInstallationQuincyHockey_Tests.m
@@ -60,7 +60,10 @@ - (void) testQuincyInstall
 - (void) testQuincyInstallMissingProperties
 {
     KSCrashInstallationQuincy* installation = [KSCrashInstallationQuincy sharedInstance];
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wnonnull"
     installation.url = nil;
+#pragma clang diagnostic pop
     [installation installWithConfiguration:nil];
     [installation sendAllReportsWithCompletion:^(__unused NSArray *filteredReports, BOOL completed, NSError *error)
      {