diff --git a/RollbarCommon/Sources/RollbarCommon/DTOs/RollbarDTO+Protected.m b/RollbarCommon/Sources/RollbarCommon/DTOs/RollbarDTO+Protected.m
index 440ca097..810ced3d 100644
--- a/RollbarCommon/Sources/RollbarCommon/DTOs/RollbarDTO+Protected.m
+++ b/RollbarCommon/Sources/RollbarCommon/DTOs/RollbarDTO+Protected.m
@@ -143,7 +143,16 @@ - (void)setNumber:(NSNumber *)data forKey:(NSString *)key {
 
 - (RollbarDTO *)safelyGetDataTransferObjectByKey:(NSString *)key {
     
-    RollbarDTO *result = [[RollbarDTO alloc] initWithDictionary:[self getDataByKey:key]];
+    RollbarDTO *result = [RollbarDTO alloc];
+    
+    NSDictionary<NSString *, id> *data = [self getDataByKey:key];
+    if (data) {
+        result = [result initWithDictionary:[self getDataByKey:key]];
+    }
+    else {
+        result = [result init];
+    }
+    
     return result;
 }
 
diff --git a/RollbarCommon/Sources/RollbarCommon/DTOs/RollbarDTO.m b/RollbarCommon/Sources/RollbarCommon/DTOs/RollbarDTO.m
index eca90101..dda7e55c 100644
--- a/RollbarCommon/Sources/RollbarCommon/DTOs/RollbarDTO.m
+++ b/RollbarCommon/Sources/RollbarCommon/DTOs/RollbarDTO.m
@@ -8,6 +8,7 @@
 
 #import "RollbarDTO.h"
 #import "RollbarSdkLog.h"
+#import "NSJSONSerialization+Rollbar.h"
 
 //#import <Foundation/NSObjCRuntime.h>
 //#import "objc/runtime.h"
@@ -74,46 +75,57 @@ + (nullable NSData *)dataWithJSONObject:(id)obj
 }
 
 + (NSMutableDictionary *)safeDataFromJSONObject:(id)obj {
-    NSMutableDictionary *safeData = [NSMutableDictionary new];
-    [obj enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
-        if ([obj isKindOfClass:[NSDictionary class]]) {
-            [safeData setObject:[[self class] safeDataFromJSONObject:obj] forKey:key];
-        } else if ([obj isKindOfClass:[NSArray class]]) {
-            [safeData setObject:((NSArray *)obj).mutableCopy forKey:key];
-        } else if ([obj isKindOfClass:[NSNumber class]]) {
-            [safeData setObject:obj forKey:key];
-        } else if ([obj isKindOfClass:[NSString class]]) {
-            [safeData setObject:obj forKey:key];
-        } else if ([obj isKindOfClass:[NSDate class]]) {
-            [safeData setObject:[obj description] forKey:key];
-        } else if ([obj isKindOfClass:[NSURL class]]) {
-            [safeData setObject:[obj absoluteString] forKey:key];
-        } else if ([obj isKindOfClass:[NSError class]]) {
-            [safeData setObject:[[self class] safeDataFromJSONObject:[obj userInfo]] forKey:key];
-        } else if ([obj isKindOfClass:[NSHTTPURLResponse class]]) {
-            [safeData setObject:[obj allHeaderFields] forKey:key];
-        } else if ([obj isKindOfClass:[NSSet class]]) {
-            [safeData setObject:[[obj allObjects] componentsJoinedByString:@","] forKey:key];
-        } else if ([obj isKindOfClass:[NSData class]]) {
-            NSError* error = nil;
-            NSMutableDictionary* json =
-                [NSJSONSerialization JSONObjectWithData:obj
-                                                options:(NSJSONReadingMutableContainers | NSJSONReadingMutableLeaves)
-                                                  error:&error];
-
-            if (error == nil) {
-                [safeData setObject:[[self class] safeDataFromJSONObject:json] forKey:key];
-            } else {
-                RollbarSdkLog(@"Error serializing NSData: %@", [error localizedDescription]);
-            }
-        } else if ([NSJSONSerialization isValidJSONObject:@{key:obj}]) {
-                [safeData setObject:obj forKey:key];
-        } else {
-            RollbarSdkLog(@"Error serializing class '%@' using NSJSONSerialization",
-                       NSStringFromClass([obj class]));
-        }
-    }];
-    return safeData;
+    
+    return [NSJSONSerialization rollbar_safeDataFromJSONObject:obj];
+    
+//    NSMutableDictionary *safeData = [NSMutableDictionary new];
+//    [obj enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
+//        
+//        if ([obj isKindOfClass:[NSDictionary class]]) {
+//            [safeData setObject:[[self class] safeDataFromJSONObject:obj] forKey:key];
+//        } else if ([obj isKindOfClass:[NSArray class]]) {
+//            [safeData setObject:((NSArray *)obj).mutableCopy forKey:key];
+//        } else if ([obj isKindOfClass:[NSNumber class]]) {
+//            [safeData setObject:obj forKey:key];
+//        } else if ([obj isKindOfClass:[NSString class]]) {
+//            [safeData setObject:obj forKey:key];
+//        } else if ([obj isKindOfClass:[NSDate class]]) {
+//            [safeData setObject:[obj description] forKey:key];
+//        } else if ([obj isKindOfClass:[NSURL class]]) {
+//            NSString *url = [obj absoluteString];
+//            if (url) {
+//                [safeData setObject:[obj absoluteString] forKey:key];
+//            }
+//            else if([obj description]) {
+//                [safeData setObject:[obj description] forKey:key];
+//            }
+//        } else if ([obj isKindOfClass:[NSError class]]) {
+//            [safeData setObject:[[self class] safeDataFromJSONObject:[obj userInfo]] forKey:key];
+//        } else if ([obj isKindOfClass:[NSHTTPURLResponse class]]) {
+//            [safeData setObject:[obj allHeaderFields] forKey:key];
+//        } else if ([obj isKindOfClass:[NSSet class]]) {
+//            [safeData setObject:[[obj allObjects] componentsJoinedByString:@","] forKey:key];
+//        } else if ([obj isKindOfClass:[NSData class]]) {
+//            NSError* error = nil;
+//            NSMutableDictionary* json =
+//                [NSJSONSerialization JSONObjectWithData:obj
+//                                                options:(NSJSONReadingMutableContainers | NSJSONReadingMutableLeaves)
+//                                                  error:&error];
+//
+//            if (error == nil) {
+//                [safeData setObject:[[self class] safeDataFromJSONObject:json] forKey:key];
+//            } else {
+//                RollbarSdkLog(@"Error serializing NSData: %@", [error localizedDescription]);
+//            }
+//        } else if ([NSJSONSerialization isValidJSONObject:@{key:obj}]) {
+//                [safeData setObject:obj forKey:key];
+//        } else {
+//            RollbarSdkLog(@"Error serializing class '%@' using NSJSONSerialization",
+//                       NSStringFromClass([obj class]));
+//        }
+//    }];
+//    
+//    return safeData;
 }
 
 + (unsigned long)measureJSONDataByteSize:(NSData*)jsonData {
@@ -207,16 +219,21 @@ - (NSArray *)getDefinedProperties {
     
     NSMutableArray *result = [NSMutableArray array];
     
-    unsigned int outCount, i;
+    unsigned int outCount;
     objc_property_t *properties = class_copyPropertyList([self class], &outCount);
+    if (!properties) {
+        return result;
+    }
     
-    for(i = 0; i < outCount; ++i) {
+    for(unsigned int i = 0; i < outCount; ++i) {
         objc_property_t property = properties[i];
         const char *propName = property_getName(property);
         if(propName) {
             NSString *propertyName = [NSString stringWithCString:propName
                                                         encoding:[NSString defaultCStringEncoding]];
-            [result addObject:propertyName];
+            if (propertyName) {
+                [result addObject:propertyName];
+            }
         }
     }
     
diff --git a/RollbarCommon/Sources/RollbarCommon/NSJSONSerialization+Rollbar.m b/RollbarCommon/Sources/RollbarCommon/NSJSONSerialization+Rollbar.m
index 978098ce..8963c0e5 100644
--- a/RollbarCommon/Sources/RollbarCommon/NSJSONSerialization+Rollbar.m
+++ b/RollbarCommon/Sources/RollbarCommon/NSJSONSerialization+Rollbar.m
@@ -40,15 +40,28 @@ + (NSMutableDictionary *)rollbar_safeDataFromJSONObject:(id)obj {
     
     NSMutableDictionary *safeData = [NSMutableDictionary new];
     [obj enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
+        
         if ([obj isKindOfClass:[NSDictionary class]]) {
             [safeData setObject:[[self class] rollbar_safeDataFromJSONObject:obj] forKey:key];
+        } else if ([obj isKindOfClass:[NSArray class]]) {
+            [safeData setObject:((NSArray *)obj).mutableCopy forKey:key];
         } else if ([NSJSONSerialization isValidJSONObject:@{key:obj}]) {
             [safeData setObject:obj forKey:key];
+        } else if ([obj isKindOfClass:[NSNumber class]]) {
+            [safeData setObject:obj forKey:key];
+        } else if ([obj isKindOfClass:[NSString class]]) {
+            [safeData setObject:obj forKey:key];
         } else if ([obj isKindOfClass:[NSDate class]]) {
             [safeData setObject:[obj description] forKey:key];
         } else if ([obj isKindOfClass:[NSURL class]]) {
-            [safeData setObject:[obj absoluteString] forKey:key];
-        } else if ([obj isKindOfClass:[NSError class]]) {
+            NSString *url = [obj absoluteString];
+            if (url) {
+                [safeData setObject:[obj absoluteString] forKey:key];
+            }
+            else if([obj description]) {
+                [safeData setObject:[obj description] forKey:key];
+            }
+        } else if ([obj isKindOfClass:[NSError class]] && [obj userInfo]) {
             [safeData setObject:[[self class] rollbar_safeDataFromJSONObject:[obj userInfo]] forKey:key];
         } else if ([obj isKindOfClass:[NSHTTPURLResponse class]]) {
             [safeData setObject:[obj allHeaderFields] forKey:key];
diff --git a/RollbarCommon/Sources/RollbarCommon/include/NSJSONSerialization+Rollbar.h b/RollbarCommon/Sources/RollbarCommon/include/NSJSONSerialization+Rollbar.h
index 59df6b5e..02fc973b 100644
--- a/RollbarCommon/Sources/RollbarCommon/include/NSJSONSerialization+Rollbar.h
+++ b/RollbarCommon/Sources/RollbarCommon/include/NSJSONSerialization+Rollbar.h
@@ -22,7 +22,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 /// Turns JSON-like object structure into a valid NSJSONSerialization structure
 /// @param obj JSON-like object
-+ (NSDictionary *)rollbar_safeDataFromJSONObject:(id)obj;
++ (NSMutableDictionary *)rollbar_safeDataFromJSONObject:(id)obj;
 
 /// Byte-length of a NSData representation of a JSON structure
 /// @param jsonData NSData representation of a JSON structure
diff --git a/RollbarCommon/Sources/RollbarCommon/include/RollbarDTO+Protected.h b/RollbarCommon/Sources/RollbarCommon/include/RollbarDTO+Protected.h
index c8742025..903b68b4 100644
--- a/RollbarCommon/Sources/RollbarCommon/include/RollbarDTO+Protected.h
+++ b/RollbarCommon/Sources/RollbarCommon/include/RollbarDTO+Protected.h
@@ -41,7 +41,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (NSMutableDictionary *)safelyGetDictionaryByKey:(NSString *)key;
 - (NSMutableArray *)safelyGetArrayByKey:(NSString *)key;
 - (NSMutableString *)safelyGetStringByKey:(NSString *)key;
-- (NSNumber *)safelyGetNumberByKey:(NSString *)key;
+- (nullable NSNumber *)safelyGetNumberByKey:(NSString *)key;
 
 #pragma mark - Core API: data setters by key