fix

Cartfile.resolved

@@ -16,7 +16,7 @@ github "kishikawakatsumi/UICKeyChainStore" "v2.1.2"
 github "krzyzanowskim/OpenSSL" "1.0.218"
 github "malcommac/SwiftRichString" "3.7.1"
 github "marinofaggiana/AFNetworking" "2967678c3e0e98c9b8d7e06222ad12d1f49c26f2"
-github "nextcloud/ios-communication-library" "c3877ede170cb312dc99f3031a0dba2e2851b8b0"
+github "nextcloud/ios-communication-library" "26dee50d6c7f4bc76277a6adc216cdb4c8adaa21"
 github "realm/realm-cocoa" "v4.4.0"
 github "rechsteiner/Parchment" "v1.7.0"
 github "scenee/FloatingPanel" "v1.7.4"

iOSClient/Utility/CCUtility.m

@@ -1446,6 +1446,7 @@
             NSURL *url = [NSURL URLWithString:serverUrl];
             serverUrl = [url URLByDeletingLastPathComponent].absoluteString;
             serverUrl = [serverUrl substringToIndex:[serverUrl length]-1];
+            if (serverUrl == nil) { return false; }
             directory = [[NCManageDatabase sharedInstance] getTableDirectoryWithPredicate:[NSPredicate predicateWithFormat:@"account == %@ AND serverUrl == %@", account, serverUrl]];
         }