diff --git a/github/PaginatedList.py b/github/PaginatedList.py
index 81e21220..04d5712c 100644
--- a/github/PaginatedList.py
+++ b/github/PaginatedList.py
@@ -175,7 +175,7 @@ class PaginatedList(PaginatedListBase):
         self.__nextParams = None
 
         if self.__list_item in data:
-            self.__totalCount = data['total_count']
+            self.__totalCount = data.get('total_count')
             data = data[self.__list_item]
 
         content = [
@@ -211,7 +211,7 @@ class PaginatedList(PaginatedListBase):
         )
 
         if self.__list_item in data:
-            self.__totalCount = data['total_count']
+            self.__totalCount = data.get('total_count')
             data = data[self.__list_item]
 
         return [
diff --git a/github/PullRequest.py b/github/PullRequest.py
index dd2a8b5d..3a63d660 100644
--- a/github/PullRequest.py
+++ b/github/PullRequest.py
@@ -538,7 +538,8 @@ class PullRequest(github.GithubObject.CompletableGithubObject):
             self._requester,
             self.url + "/requested_reviewers",
             None,
-            headers={'Accept': 'application/vnd.github.black-cat-preview+json'}
+            headers={'Accept': 'application/vnd.github.black-cat-preview+json'},
+            list_item='users'
         )
 
     def is_merged(self):