Use of UISearchController causes objc_weak_error - ios

Question

After adding an UISearchController to a UITableViewController, the following objc_weak_error is logged every time the app goes to to the background (by hitting the home button) if the "Malloc Scribble" Diagnostics option is activated in the Run Scheme.
objc[8426]: __weak variable at 0x... holds 0x5555555555555555 instead
of 0x.... This is probably incorrect use of objc_storeWeak() and
objc_loadWeak(). Break on objc_weak_error to debug.
Setting the suggested breakpoint unfortunately does not provide helpful information.
I have faced this issue in a larger project, so I tried to reproduce it on a very simple app based on the "Single View App" template (xcode 10.1) with an UITableViewController embedded in a Navigation Controller with the following code. After performing a search, going to the background by hitting the home button will always trigger the error.
I was not able to find any useful information about this issue neither on stackoverflow nor on the web.
import UIKit
class TableViewController: UITableViewController {
let data = ["Berlin", "London", "New York", "Paris", "Tokyo"]
var filteredData = [String]()
let searchController = UISearchController(searchResultsController: nil)
override func viewDidLoad() {
super.viewDidLoad()
searchController.searchResultsUpdater = self
searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search Candies"
navigationItem.searchController = searchController
definesPresentationContext = true
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return isFiltering() ? filteredData.count : data.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = isFiltering() ? filteredData[indexPath.row] : data[indexPath.row]
return cell
}
func searchBarIsEmpty() -> Bool {
return searchController.searchBar.text?.isEmpty ?? true
}
func filterContentForSearchText(_ searchText: String, scope: String = "All") {
filteredData = data.filter { $0.lowercased().contains(searchText.lowercased())}
tableView.reloadData()
}
func isFiltering() -> Bool {
return searchController.isActive && !searchBarIsEmpty()
}
}
extension TableViewController: UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
filterContentForSearchText(searchController.searchBar.text!)
}
}
Is the error a result of a wrong usage of UISearchController in the code above or is this an iOS bug?
Or can it just be ignored?