diff --git a/lib/RequestCore.class.php b/lib/RequestCore.class.php
index a98c97cef5d5ec546c373762463ed0d6631a8a47..162732122a3461fd07790403779c2b968e669b2a 100644
--- a/lib/RequestCore.class.php
+++ b/lib/RequestCore.class.php
@@ -766,8 +766,18 @@ class RequestCore
 			$this->response = $response;
 		}
 
-		// As long as this came back as a valid resource...
-		if (is_resource($this->curl_handle))
+		$handleResponse = false;
+		// @link https://www.php.net/manual/en/function.curl-init.php#refsect1-function.curl-init-changelog
+		if (version_compare(PHP_VERSION, '8.0.0', '>=')) {
+			if (get_class($this->curl_handle) == 'CurlHandle') {
+				$handleResponse = true;
+			}
+		} else {
+			if (is_resource($this->curl_handle)) {
+				$handleResponse = true;
+			}
+		}
+		if ($handleResponse)
 		{
 			// Determine what's what.
 			$header_size = curl_getinfo($this->curl_handle, CURLINFO_HEADER_SIZE);