diff --git a/locales/en.json b/locales/en.json
index 806def22a..7de00f395 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -256,5 +256,6 @@
     "certmanager_cert_signing_failed" : "Signing the new certificate failed.",
     "certmanager_no_cert_file" : "Unable to read certificate file for domain {domain:s} (file : {file:s})",
     "certmanager_conflicting_nginx_file": "Unable to prepare domain for ACME challenge : the nginx configuration file {filepath:s} is conflicting and should be removed first.",
-    "certmanager_unable_to_determine_self_CA_name": "Unable to determine name of self-signing authority."
+    "certmanager_self_ca_conf_file_not_found" : "Configuration file not found for self-signing CA ({file:s})",
+    "certmanager_unable_to_parse_self_CA_name": "Unable to parse name of self-signing authority in {file:s}."
 }
diff --git a/src/yunohost/certificate.py b/src/yunohost/certificate.py
index 74e93314c..8209160a4 100644
--- a/src/yunohost/certificate.py
+++ b/src/yunohost/certificate.py
@@ -812,17 +812,18 @@ def _domain_is_accessible_through_HTTP(ip, domain):
 def _name_self_CA():
     ca_conf = os.path.join(SSL_DIR, "openssl.ca.cnf")
 
-    try :
-        with open(ca_conf) as f:
-            lines = f.readlines()
+    if not os.path.exists(ca_conf) :
+        logger.warning(m18n.n('certmanager_self_ca_conf_file_not_found', file=ca_conf))
+        return ""
 
-        for line in lines:
-            if line.startswith("commonName_default"):
-                return line.split()[2]
-    except:
-        pass
+    with open(ca_conf) as f:
+        lines = f.readlines()
 
-    logger.warning(m18n.n('certmanager_unable_to_determine_self_CA_name'))
+    for line in lines:
+        if line.startswith("commonName_default"):
+            return line.split()[2]
+
+    logger.warning(m18n.n('certmanager_unable_to_parse_self_CA_name', file=ca_conf))
     return ""