diff --git a/mapiris/main.py b/mapiris/main.py
index 3915c4561979a4a0a808494faf8dec7eeef63978..229874c83ab04350965717162828da234fe2f43e 100644
--- a/mapiris/main.py
+++ b/mapiris/main.py
@@ -15,8 +15,9 @@ url = 'http://127.0.0.1:8081'
 
 
 @app.route('/', defaults={'page': None})
-#@app.route('/<page>', methods=["GET", "POST"])
 def index(page):
+    if not model.db.connection_status:  # if no connection, display a flashing message
+        flash("Could not connect to the MongoDB database ! Check the connection.", "danger")
     return render_template('index.html')
 
 
diff --git a/mapiris/model.py b/mapiris/model.py
index cc208184642efe8856138dd7cd21165df8ea8f83..47cd89ca569300511ae641ea01bd99cf1cd901d1 100644
--- a/mapiris/model.py
+++ b/mapiris/model.py
@@ -11,7 +11,6 @@ import json
 # connection to the IRIS collection in MongoDB
 db = Mongiris()
 iris_collection = db.collection_iris
-db.init_connection()
 json_iris_indicator_code_to_label = 'static/data/dictionnaire-indicateurs.json'
 
 
diff --git a/mapiris/templates/form.html b/mapiris/templates/form.html
index 9f4d7190cb2c3af0f1de57d27ccdee646e07abe3..87656c2800e4b5f44250a7a6912e497f4b1de01e 100644
--- a/mapiris/templates/form.html
+++ b/mapiris/templates/form.html
@@ -5,9 +5,9 @@
 <div class="input-group mb-4">
     <div class="input-group-prepend">
         <button class="btn" type="button" id="boutonEnableDisableZoom">
-            <img src="{{url_for('static', filename='css/open-iconic-master/svg/lock-unlocked.svg')}}" width="16" height="16" alt="Enable/Disable" />
+            <img src="{{url_for('static', filename='css/open-iconic-master/svg/lock-locked.svg')}}" width="16" height="16" alt="Enable/Disable" />
         </button>
-        <input type="number" min="12" max="18" value="16" maxlength="1" id="inputZoomLevel" style="width: 3em;" />
+        <input type="number" min="12" max="18" value="16" disabled maxlength="1" id="inputZoomLevel" style="width: 3em;" />
         <span valign="bottom" class="ml-2 pt-1">
         (niveau de zoom actuel =&nbsp;<span id="spanZoomLevel" style="font-weight: bold;">6</span>)
         </span>
diff --git a/setup.cfg b/setup.cfg
index ad4581beb5e9746825aa800d67970a8240d20df6..cb8c5f60b5c27e8a15be0716ecf0e0f9e6f2e070 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = mapiris
-version = 0.12
+version = 0.13
 description = This package aims at searching and printing IRIS on a map.
 author = Fabien Duchateau
 author_email = fabien.duchateau@univ-lyon1.fr