diff --git a/src/PhpImap/Imap.php b/src/PhpImap/Imap.php
index 80e4d3e9..16f7d878 100644
--- a/src/PhpImap/Imap.php
+++ b/src/PhpImap/Imap.php
@@ -715,7 +715,7 @@ public static function open(
         $result = @\imap_open($mailbox, $username, $password, $options, $n_retries, $params);
 
         if (!$result) {
-            throw new ConnectionException(\imap_errors());
+            throw new ConnectionException(\imap_errors() ?: []);
         }
 
         return $result;
diff --git a/src/PhpImap/Mailbox.php b/src/PhpImap/Mailbox.php
index d6e2514c..626bb854 100644
--- a/src/PhpImap/Mailbox.php
+++ b/src/PhpImap/Mailbox.php
@@ -611,7 +611,17 @@ public function getImapStream(bool $forceConnection = true)
 
     public function hasImapStream(): bool
     {
-        return (\is_resource($this->imapStream) || $this->imapStream instanceof \IMAP\Connection) && \imap_ping($this->imapStream);
+        try {
+            return (\is_resource($this->imapStream) || $this->imapStream instanceof \IMAP\Connection) && \imap_ping($this->imapStream);
+        } catch (\Error $exception) {
+            // From PHP 8.1.10 imap_ping() on a closed stream throws a ValueError. See #680.
+            $valueError = '\ValueError';
+            if (class_exists($valueError) && $exception instanceof $valueError) {
+                return false;
+            }
+
+            throw $exception;
+        }
     }
 
     /**