diff --git a/src/main.py b/src/main.py
index 3c449c4..d7695e4 100644
--- a/src/main.py
+++ b/src/main.py
@@ -44,7 +44,7 @@ from web import Web  # Wrapper for the web routes and API
 
 app = Flask(__name__)
 socketio = SocketIO(app)
-ALLOWED_EXTENSIONS = {"png", "jpg", "jpeg", "gif","webp"}
+ALLOWED_EXTENSIONS = {"png", "jpg", "jpeg", "gif", "webp"}
 
 # Load the configuration file
 try:
@@ -82,6 +82,7 @@ except FileExistsError:
     app.logger.debug("Directory %s already exists.", UPLOAD_FOLDER)
 except PermissionError:
     app.logger.error("Permission denied: Unable to create %s", UPLOAD_FOLDER)
+    exit(77)
 
 # Output the config file
 if os.getenv("LIPY_DEBUG") is True:
@@ -165,14 +166,20 @@ def api_print_sms():
     app.logger.debug("Printing an sms")
     try:
         txt = request.form["txt"]
-        sign = request.form["signature"]
     except werkzeug.exceptions.BadRequestKeyError as e:
-        app.logger.error(
-            "Whoops, no forms submitted or missing signature : %s ", str(e)
-        )
+        app.logger.error("Whoops, we are missing the txt input field. : %s ", str(e))
         flash("Whoops, no forms submitted or missing signature : %s", str(e))
         return redirect(url_for("index"))
 
+    try:
+        # comment: We try to get a signature
+        sign = request.form["signature"]
+    except werkzeug.exceptions.BadRequestKeyError as e:
+        app.logger.warning(
+            "No signature found for this print, using default signature.", str(e)
+        )
+        sign = configuration_file["defaults"]["signature"]
+
     web.print_sms(txt, sign)
     return redirect(url_for("index"))
 
@@ -184,11 +191,13 @@ def api_print_image():
     app.logger.debug("Printing an image")
 
     try:
+        # comment: We try to get a signature
         sign = request.form["signature"]
-    except Exception as e:
-        app.logger.error("Whoops, no forms submitted or missing signature : %s", str(e))
-        flash("Whoops, no forms submitted or missing signature : %s ", str(e))
-        return redirect(url_for("index"))
+    except werkzeug.exceptions.BadRequestKeyError as e:
+        app.logger.warning(
+            "No signature found for this print, using default signature.", str(e)
+        )
+        sign = configuration_file["defaults"]["signature"]
 
     if request.method == "POST":
         # check if the post request has the file part
@@ -258,7 +267,7 @@ def ratelimit_handler(e):
         "Rate limit reached, please slow down :) ( Currently at " + e.description + ")",
         "error",
     )
-    app.logger.debug("Rate limit reached %s " , str(e.description))
+    app.logger.debug("Rate limit reached %s ", str(e.description))
     return redirect(url_for("index"))
 
 
@@ -274,7 +283,7 @@ def ping():
 @socketio.on("ping")
 def handle_message(data):
     """Handle sockets pings"""
-    app.logger.debug("Received : %s " , str(data))
+    app.logger.debug("Received : %s ", str(data))
     socketio.emit("pong", "Pong !")