diff --git a/release.sh b/release.sh
index 82baa93535ad0f1046975d47b5d301d2f8c46bd2..e8be965b5af5c7140cecdc4d42cfb7472013c3ab 100755
--- a/release.sh
+++ b/release.sh
@@ -4,7 +4,7 @@
 current=`grep -P "__version_info__ = \(\'\d+\', \'\d+\', \'\d+(\w*)\'\)" src/sakia/__init__.py | grep -oP "\'\d+\', \'\d+\', \'\d+(\w*)\'"`
 echo "Current version: $current"
 
-if [[ $1 =~ ^[0-9]+.[0-9]+.[0-9]+[0-9a-z]+$ ]]; then
+if [[ $1 =~ ^[0-9]+.[0-9]+.[0-9]+[0-9a-z]*$ ]]; then
   IFS='.' read -r -a array <<< "$1"
   sed -i "s/__version_info__\ = ($current)/__version_info__ = ('${array[0]}', '${array[1]}', '${array[2]}')/g" src/sakia/__init__.py
   sed -i "s/#define MyAppVerStr .*/#define MyAppVerStr \"$1\"/g" ci/appveyor/sakia.iss
diff --git a/src/sakia/tests/unit/core/graph/test_explorer_graph.py b/src/sakia/tests/unit/core/graph/test_explorer_graph.py
index e4a4e1e0ef00ef5273eccdfdc96a9b60d02f4c2e..e3c99600bc1507f49da756241ee3c4977cf643a0 100644
--- a/src/sakia/tests/unit/core/graph/test_explorer_graph.py
+++ b/src/sakia/tests/unit/core/graph/test_explorer_graph.py
@@ -126,6 +126,7 @@ class TestExplorerGraph(unittest.TestCase, QuamashTest):
     def test_explore_full_from_center(self, app, community):
         community.parameters = CoroutineMock(return_value = {'sigValidity': 1000})
         community.network.confirmations = Mock(side_effect=lambda n: 4 if 996 else None)
+        community.nb_members = CoroutineMock(return_value = 3)
         app.preferences = {'expert_mode': True}
 
         explorer_graph = ExplorerGraph(app, community)
@@ -143,6 +144,7 @@ class TestExplorerGraph(unittest.TestCase, QuamashTest):
     def test_explore_full_from_extremity(self, app, community):
         community.parameters = CoroutineMock(return_value = {'sigValidity': 1000})
         community.network.confirmations = Mock(side_effect=lambda n: 4 if 996 else None)
+        community.nb_members = CoroutineMock(return_value = 3)
         app.preferences = {'expert_mode': True}
 
         explorer_graph = ExplorerGraph(app, community)
@@ -160,6 +162,7 @@ class TestExplorerGraph(unittest.TestCase, QuamashTest):
     def test_explore_partial(self, app, community):
         community.parameters = CoroutineMock(return_value = {'sigValidity': 1000})
         community.network.confirmations = Mock(side_effect=lambda n: 4 if 996 else None)
+        community.nb_members = CoroutineMock(return_value = 3)
         app.preferences = {'expert_mode': True}
 
         explorer_graph = ExplorerGraph(app, community)