diff --git a/iOS_SDK/OneSignalSDK/UnitTests/UnitTests.m b/iOS_SDK/OneSignalSDK/UnitTests/UnitTests.m
index f79b0ee3f..8d6a38d62 100644
--- a/iOS_SDK/OneSignalSDK/UnitTests/UnitTests.m
+++ b/iOS_SDK/OneSignalSDK/UnitTests/UnitTests.m
@@ -2386,4 +2386,10 @@ - (void)testAllowsIncreasedAPNSTokenSize
     XCTAssertEqualObjects(OneSignalClientOverrider.lastHTTPRequest[@"identifier"], UIApplicationOverrider.mockAPNSToken);
 }
 
+- (void)testHexStringFromDataWithInvalidValues {
+    XCTAssertNil([NSString hexStringFromData:nil]);
+    XCTAssertNil([NSString hexStringFromData:NULL]);
+    XCTAssertNil([NSString hexStringFromData:[NSData new]]);
+}
+
 @end