diff --git a/main.py b/main.py
index 169d88d..bd5ada2 100644
--- a/main.py
+++ b/main.py
@@ -24,6 +24,10 @@ def generate_ssl_files():
                 os.path.isfile(SSL_KEY_FILE))):
         generate_ssl_files()
 
+    if not os.path.isfile(SSL_CLIENT_CERT_FILE):
+        logger.error("Client's certificate file specified on SSL_CLIENT_CERT_FILE is missing")
+        exit(0)
+
     authenticator = SSLAuthenticator(keyfile=SSL_KEY_FILE,
                                      certfile=SSL_CERT_FILE,
                                      ca_certs=SSL_CLIENT_CERT_FILE)