Fix NullPointerException

✅ Solution

NullPointerExceptions in Flutter often arise when accessing properties or methods of a variable that unexpectedly holds a null value. To fix this, use null-aware operators like `?.` (safe navigation) to conditionally access members and `??` (null coalescing) to provide default values. Alternatively, use `assert` statements or conditional checks (`if (object != null)`) to ensure variables are not null before use, especially when interacting with nullable types or external data.