diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 9c81333a..36458ff1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -12,10 +12,10 @@ coverage:
   script:
     - apt update
     - apt install -y curl gnupg2 git
-    - curl https://storage.googleapis.com/dart-archive/channels/stable/release/2.7.2/linux_packages/dart_2.7.2-1_amd64.deb > dart.deb
-    - apt install -y ./dart.deb
+    - curl https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
+    - curl https://storage.googleapis.com/download.dartlang.org/linux/debian/dart_stable.list > /etc/apt/sources.list.d/dart_stable.list
     - apt update
-    - apt install -y chromium lcov libolm3 sqlite3 libsqlite3-dev
+    - apt install -y dart chromium lcov libolm3 sqlite3 libsqlite3-dev
     - ln -s /usr/lib/dart/bin/pub /usr/bin/
     - useradd -m test
     - chown -R 'test:' '.'
@@ -27,19 +27,19 @@ coverage:
     paths:
       - coverage/
 
-
 coverage_without_olm:
   tags:
     - linux
   stage: coverage
   image: debian:testing
-  coverage: '/^\s+lines.+: (\d+.\d*%)/'
   dependencies: []
   script:    
     - apt update
-    - apt install -y curl git sqlite3 libsqlite3-dev
-    - curl https://storage.googleapis.com/dart-archive/channels/stable/release/2.7.2/linux_packages/dart_2.7.2-1_amd64.deb > dart.deb
-    - apt install -y ./dart.deb
+    - apt install -y curl gnupg2 git sqlite3 libsqlite3-dev
+    - curl https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
+    - curl https://storage.googleapis.com/download.dartlang.org/linux/debian/dart_stable.list > /etc/apt/sources.list.d/dart_stable.list
+    - apt update
+    - apt install -y dart
     - ln -s /usr/lib/dart/bin/pub /usr/bin/
     - useradd -m test
     - chown -R 'test:' '.'
@@ -101,5 +101,4 @@ pages:
     paths:
       - public
   only:
-    - master
-    
\ No newline at end of file
+    - master
\ No newline at end of file
diff --git a/lib/matrix_api/matrix_api.dart b/lib/matrix_api/matrix_api.dart
index 60155fdf..aac40813 100644
--- a/lib/matrix_api/matrix_api.dart
+++ b/lib/matrix_api/matrix_api.dart
@@ -1327,7 +1327,7 @@ class MatrixApi {
     headers['Content-Type'] = contentType ?? mime(fileName);
     fileName = Uri.encodeQueryComponent(fileName);
     final url =
-        '$homeserver.toString()/_matrix/media/r0/upload?filename=$fileName';
+        '${homeserver.toString()}/_matrix/media/r0/upload?filename=$fileName';
     final streamedRequest = http.StreamedRequest('POST', Uri.parse(url))
       ..headers.addAll(headers);
     streamedRequest.contentLength = await file.length;
@@ -2022,6 +2022,7 @@ class MatrixApi {
     final response = await request(
       RequestType.POST,
       '/client/r0/user/${Uri.encodeComponent(userId)}/openid/request_token',
+      data: {},
     );
     return OpenIdCredentials.fromJson(response);
   }
diff --git a/lib/src/room.dart b/lib/src/room.dart
index dfb34877..b0af9b19 100644
--- a/lib/src/room.dart
+++ b/lib/src/room.dart
@@ -185,7 +185,8 @@ class Room {
   }
 
   /// The address in the format: #roomname:homeserver.org.
-  String get canonicalAlias => states[EventTypes.RoomCanonicalAlias] != null
+  String get canonicalAlias => states[EventTypes.RoomCanonicalAlias] != null &&
+          states[EventTypes.RoomCanonicalAlias].content['alias'] is String
       ? states[EventTypes.RoomCanonicalAlias].content['alias']
       : '';