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`type 'Null' is not a subtype of type 'bool'` when creating file

Feb 12, 2026, 23:03Last activity 6 months ago

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hamedOriginal post

Rank 4: Virtual Machine

Feb 12, 2026, 22:31

When creating a new file using Appwrite Flutter SDK, the file is successfully created on the server, but the client throws the following exception:

type 'Null' is not a subtype of type 'bool'

Self hosted: 1.8.1
Flutter SDK: 21.0.0

Althouh i know that this error occured when theris a missmated betwen sdk but for this error i have bothe latest appwrite version 1.8.1 and it flutter lasted sdk 21.0.0 and still facing this

Summary

An issue with type conversion is causing an error when creating files. The problem has been fixed in the latest Appwrite version, so updating to 1.8.2 or above will resolve it. Stick to version 20.1.1 until the new release is available. More details in this PR link: https://github.com/appwrite/appwrite/pull/11135.

hamed

Rank 4: Virtual Machine

Feb 12, 2026, 22:38

type 'Null' is not a subtype of type 'bool' when creating file

Namaneo

Feb 17, 2026, 09:42

Hey, I'm seeing the same issue when listing files in a bucket:

Dart

final list = await context.storage.listFiles(
  bucketId: BucketIds.images,
  queries: [Query.equal('name', name), Query.limit(1)],
);

This is the relevant stacktrace:

type 'Null' is not a subtype of type 'bool'
#0      new File.fromMap (package:dart_appwrite/src/models/file.dart:73)
#1      new FileList.fromMap.<anonymous closure> (package:dart_appwrite/src/models/file_list.dart:19)
#2      MappedListIterable.elementAt (dart:_internal/iterable.dart:442)
#3      ListIterator.moveNext (dart:_internal/iterable.dart:371)
#4      new List.from (dart:core-patch/array_patch.dart:29)
#5      new FileList.fromMap (package:dart_appwrite/src/models/file_list.dart:19)
#6      Storage.listFiles (package:dart_appwrite/services/storage.dart:161)

Self hosted: 1.8.1
dart_appwrite: 21.1.0

Have you found more info, or a workaround?

Namaneo

Feb 17, 2026, 10:58

Looks like the encryption property is missing from the File payload. Tried to disable and re-enable encryption on the bucket settings, without success.

Namaneo

Feb 17, 2026, 11:23

Went step by step, encryption is indeed missing, as well as compression.

Namaneo

Feb 17, 2026, 11:29

Aaaaand I just found this PR: https://github.com/appwrite/appwrite/pull/11135
Looks like the issue is already fixed, we just have to wait for the next Appwrite version to be released.

Namaneo

Feb 17, 2026, 12:05

For reference, the encryption and compression properties were added in dart_appwrite 21.0.0.
Sticking to 20.1.1 resolves the issue until Appwrite 1.8.2 (or above) gets released.

`type 'Null' is not a subtype of type 'bool'` when creating file

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