diff --git a/BUGS.md b/BUGS.md
index 1328ef7..6223124 100644
--- a/BUGS.md
+++ b/BUGS.md
@@ -1,7 +1,6 @@
 
 # BUGS
 
-- dependencias que não são goals de um curso, só devem aparecer se ainda não tiverem sido feitas.
 - goals se forem do tipo chapter deve importar todas as dependencias do chapter (e não mostrar chapters?).
 - nao esta a seguir o max_tries definido no ficheiro de dependencias.
 - devia mostrar timeout para o aluno saber a razao.
@@ -9,7 +8,6 @@
 - templates question-*.html tem input hidden question_ref que não é usado. remover?
 - shift-enter não está a funcionar
 - default prefix should be obtained from each course (yaml conf)?
-- initdb da integrity error se no mesmo comando existirem alunos repetidos (p.ex em ficheiros csv diferentes ou entre csv e opcao -a)
 
 # TODO
 
@@ -34,6 +32,8 @@
 
 # FIXED
 
+- initdb da integrity error se no mesmo comando existirem alunos repetidos (p.ex em ficheiros csv diferentes ou entre csv e opcao -a)
+- dependencias que não são goals de um curso, só devem aparecer se ainda não tiverem sido feitas.
 - ir para inicio da pagina quando le nova pergunta.
 - CRITICAL nao esta a guardar o progresso na base de dados.
 - mesma ref no mesmo ficheiro não é detectado.
diff --git a/aprendizations/__init__.py b/aprendizations/__init__.py
index 995c624..a98f005 100644
--- a/aprendizations/__init__.py
+++ b/aprendizations/__init__.py
@@ -30,7 +30,7 @@ are progressively uncovered as the students progress.
 '''
 
 APP_NAME = 'aprendizations'
-APP_VERSION = '2020.01.dev1'
+APP_VERSION = '2020.01.dev2'
 APP_DESCRIPTION = __doc__
 
 __author__ = 'Miguel Barão'
diff --git a/aprendizations/learnapp.py b/aprendizations/learnapp.py
index 6171ab6..edc7e4b 100644
--- a/aprendizations/learnapp.py
+++ b/aprendizations/learnapp.py
@@ -245,7 +245,7 @@ class LearnApp(object):
     async def check_answer(self, uid: str, answer) -> Question:
         student = self.online[uid]['state']
         await student.check_answer(answer)
-        q = student.get_current_question()
+        q: Question = student.get_current_question()
 
         logger.info(f'User "{uid}" got {q["grade"]:.2} in "{q["ref"]}"')
 
@@ -430,7 +430,7 @@ class LearnApp(object):
     # makes factory for a single topic
     # ------------------------------------------------------------------------
     def factory_for(self, tref: str) -> Dict[str, QFactory]:
-        factory = {}
+        factory: Dict[str, QFactory] = {}
         g = self.deps
         t = g.nodes[tref]  # get node
 
@@ -447,9 +447,12 @@ class LearnApp(object):
         try:
             questions: List[QDict] = load_yaml(fullpath)
         except Exception:
-            msg = f'Failed to load "{fullpath}"'
-            logger.error(msg)
-            raise LearnException(msg)
+            if t['type'] == 'chapter':
+                return factory  # chapters may have no "questions"
+            else:
+                msg = f'Failed to load "{fullpath}"'
+                logger.error(msg)
+                raise LearnException(msg)
 
         if not isinstance(questions, list):
             msg = f'File "{fullpath}" must be a list of questions'
@@ -500,40 +503,37 @@ class LearnApp(object):
 
     # ------------------------------------------------------------------------
     def get_student_progress(self, uid: str) -> float:
-        return self.online[uid]['state'].get_topic_progress()
+        return float(self.online[uid]['state'].get_topic_progress())
 
     # ------------------------------------------------------------------------
     def get_current_question(self, uid: str) -> Optional[Question]:
-        return self.online[uid]['state'].get_current_question()
+        q: Optional[Question] = self.online[uid]['state'].get_current_question()
+        return q
 
     # ------------------------------------------------------------------------
     def get_current_question_id(self, uid: str) -> str:
-        return self.online[uid]['state'].get_current_question()['qid']
+        return str(self.online[uid]['state'].get_current_question()['qid'])
 
     # ------------------------------------------------------------------------
     def get_student_question_type(self, uid: str) -> str:
-        return self.online[uid]['state'].get_current_question()['type']
+        return str(self.online[uid]['state'].get_current_question()['type'])
 
     # ------------------------------------------------------------------------
     def get_student_topic(self, uid: str) -> str:
-        return self.online[uid]['state'].get_current_topic()
+        return str(self.online[uid]['state'].get_current_topic())
 
     # ------------------------------------------------------------------------
     def get_student_course_title(self, uid: str) -> str:
-        return self.online[uid]['state'].get_current_course_title()
-
-    # ------------------------------------------------------------------------
-    def get_student_course_id(self, uid: str) -> Optional[str]:
-        return self.online[uid]['state'].get_current_course_id()
+        return str(self.online[uid]['state'].get_current_course_title())
 
     # ------------------------------------------------------------------------
-    # def get_student_course(self, uid: str) -> Optional[str]:
-    #     course_id = self.online[uid]['state'].get_current_course_id()
-    #     return course_id, self.courses[course_id]
+    def get_current_course_id(self, uid: str) -> Optional[str]:
+        cid: Optional[str] = self.online[uid]['state'].get_current_course_id()
+        return cid
 
     # ------------------------------------------------------------------------
     def get_topic_name(self, ref: str) -> str:
-        return self.deps.nodes[ref]['name']
+        return str(self.deps.nodes[ref]['name'])
 
     # ------------------------------------------------------------------------
     def get_current_public_dir(self, uid: str) -> str:
@@ -542,10 +542,11 @@ class LearnApp(object):
         return path.join(prefix, topic, 'public')
 
     # ------------------------------------------------------------------------
-    def get_courses(self, uid: str) -> Dict:
+    def get_courses(self) -> Dict[str, Dict[str, Any]]:
         return self.courses
 
-    def get_course(self, course_id: str) -> Dict:
+    # ------------------------------------------------------------------------
+    def get_course(self, course_id: str) -> Dict[str, Any]:
         return self.courses[course_id]
 
     # ------------------------------------------------------------------------
diff --git a/aprendizations/serve.py b/aprendizations/serve.py
index 7fcec7f..57bcbdd 100644
--- a/aprendizations/serve.py
+++ b/aprendizations/serve.py
@@ -96,7 +96,7 @@ class RankingsHandler(BaseHandler):
     @tornado.web.authenticated
     def get(self):
         uid = self.current_user
-        current_course = self.learn.get_student_course_id(uid)
+        current_course = self.learn.get_current_course_id(uid)
         course_id = self.get_query_argument('course', default=current_course)
         rankings = self.learn.get_rankings(uid, course_id)
         self.render('rankings.html',
@@ -195,7 +195,7 @@ class CoursesHandler(BaseHandler):
                     appname=APP_NAME,
                     uid=uid,
                     name=self.learn.get_student_name(uid),
-                    courses=self.learn.get_courses(uid),
+                    courses=self.learn.get_courses(),
                     )
 
 
@@ -242,7 +242,7 @@ class TopicHandler(BaseHandler):
                     uid=uid,
                     name=self.learn.get_student_name(uid),
                     # course_title=self.learn.get_student_course_title(uid),
-                    course_id=self.learn.get_student_course_id(uid),
+                    course_id=self.learn.get_current_course_id(uid),
                     )
 
 
--
libgit2 0.21.2