diff --git a/Sources/SwiftTimeZoneLookup/SwiftTimeZoneLookup.swift b/Sources/SwiftTimeZoneLookup/SwiftTimeZoneLookup.swift
index c23669f..9fcf075 100644
--- a/Sources/SwiftTimeZoneLookup/SwiftTimeZoneLookup.swift
+++ b/Sources/SwiftTimeZoneLookup/SwiftTimeZoneLookup.swift
@@ -13,21 +13,17 @@ public final class SwiftTimeZoneLookup {
         guard let timezone21 = Bundle.module.url(forResource: "timezone21", withExtension: "bin") else {
             throw SwiftTimeZoneLookupError.couldNotFindTimezone21bin
         }
-        
         guard let database = timezone21.withUnsafeFileSystemRepresentation({ timezone21 in
             ZDOpenDatabase(timezone21)
         }) else {
             throw SwiftTimeZoneLookupError.couldNotOpenDatabase
         }
         self.database = database
-        
-        
-        print(timezone21)
     }
     
-    public func lookup(latitude: Float, longitude: Float) -> String {
+    public func lookup(latitude: Float, longitude: Float) -> String? {
         guard let cTimezone = ZDHelperSimpleLookupString(database, latitude, longitude) else {
-            fatalError()
+            return nil
         }
         let timezone = String(cString: cTimezone)
         ZDHelperSimpleLookupStringFree(cTimezone)
diff --git a/Tests/SwiftTimeZoneLookupTests/SwiftTimeZoneLookupTests.swift b/Tests/SwiftTimeZoneLookupTests/SwiftTimeZoneLookupTests.swift
index 3c4394a..dcc6594 100644
--- a/Tests/SwiftTimeZoneLookupTests/SwiftTimeZoneLookupTests.swift
+++ b/Tests/SwiftTimeZoneLookupTests/SwiftTimeZoneLookupTests.swift
@@ -8,5 +8,7 @@ final class SwiftTimeZoneLookupTests: XCTestCase {
         XCTAssertEqual(database.lookup(latitude: 47.5, longitude: -2.6), "Europe/Paris")
         XCTAssertEqual(database.lookup(latitude: 47.5, longitude: -8.6), "Etc/GMT+1")
         XCTAssertEqual(database.lookup(latitude: 42.5, longitude: -8.6), "Europe/Madrid")
+        
+        XCTAssertEqual(database.lookup(latitude: 242.5, longitude: -8.6), nil)
     }
 }