diff --git a/LibreNMS/Authentication/ADAuthorizationAuthorizer.php b/LibreNMS/Authentication/ADAuthorizationAuthorizer.php
index 4695b7b5eb..5895dabb9c 100644
--- a/LibreNMS/Authentication/ADAuthorizationAuthorizer.php
+++ b/LibreNMS/Authentication/ADAuthorizationAuthorizer.php
@@ -78,6 +78,9 @@ class ADAuthorizationAuthorizer extends MysqlAuthorizer
             $this->userFilter($username),
             ['samaccountname']
         );
+        if ($search === false) {
+            throw new AuthenticationException('User search failed: ' . ldap_error($this->ldap_connection));
+        }
         $entries = ldap_get_entries($this->ldap_connection, $search);
 
         if ($entries['count']) {
@@ -151,6 +154,9 @@ class ADAuthorizationAuthorizer extends MysqlAuthorizer
             $this->userFilter($username),
             $attributes
         );
+        if ($search === false) {
+            throw new AuthenticationException('Role search failed: ' . ldap_error($this->ldap_connection));
+        }
         $entries = ldap_get_entries($this->ldap_connection, $search);
 
         if ($entries['count']) {
diff --git a/LibreNMS/Authentication/LdapAuthorizationAuthorizer.php b/LibreNMS/Authentication/LdapAuthorizationAuthorizer.php
index 6e69b370d9..30d82b55b7 100644
--- a/LibreNMS/Authentication/LdapAuthorizationAuthorizer.php
+++ b/LibreNMS/Authentication/LdapAuthorizationAuthorizer.php
@@ -95,6 +95,9 @@ class LdapAuthorizationAuthorizer extends AuthorizerBase
 
         $filter = '(' . Config::get('auth_ldap_prefix') . $username . ')';
         $search = ldap_search($this->ldap_connection, trim(Config::get('auth_ldap_suffix'), ','), $filter);
+        if ($search === false) {
+            throw new AuthenticationException('User search failed: ' . ldap_error($this->ldap_connection));
+        }
         $entries = ldap_get_entries($this->ldap_connection, $search);
         if ($entries['count']) {
             /*
@@ -125,6 +128,9 @@ class LdapAuthorizationAuthorizer extends AuthorizerBase
         // Find all defined groups $username is in
         $filter = '(&(|(cn=' . implode(')(cn=', array_keys(Config::get('auth_ldap_groups'))) . '))(' . Config::get('auth_ldap_groupmemberattr') . '=' . $this->getMembername($username) . '))';
         $search = ldap_search($this->ldap_connection, Config::get('auth_ldap_groupbase'), $filter);
+        if ($search === false) {
+            throw new AuthenticationException('Role search failed: ' . ldap_error($this->ldap_connection));
+        }
         $entries = ldap_get_entries($this->ldap_connection, $search);
 
         $authLdapGroups = Config::get('auth_ldap_groups');