diff --git a/src/Transport/Curl.php b/src/Transport/Curl.php
index 0b3794808..3995197f4 100644
--- a/src/Transport/Curl.php
+++ b/src/Transport/Curl.php
@@ -177,6 +177,11 @@ public function request($url, $headers = [], $data = [], $options = []) {
 			$this->stream_handle = @fopen($options['filename'], 'wb');
 			if ($this->stream_handle === false) {
 				$error = error_get_last();
+				if (!is_array($error)) {
+					// Shouldn't be possible, but can happen in test situations.
+					$error = ['message' => 'Failed to open stream'];
+				}
+
 				throw new Exception($error['message'], 'fopen');
 			}
 		}
diff --git a/src/Transport/Fsockopen.php b/src/Transport/Fsockopen.php
index 97a1f7373..15a5ba9b0 100644
--- a/src/Transport/Fsockopen.php
+++ b/src/Transport/Fsockopen.php
@@ -282,6 +282,11 @@ public function request($url, $headers = [], $data = [], $options = []) {
 			$download = @fopen($options['filename'], 'wb');
 			if ($download === false) {
 				$error = error_get_last();
+				if (!is_array($error)) {
+					// Shouldn't be possible, but can happen in test situations.
+					$error = ['message' => 'Failed to open stream'];
+				}
+
 				throw new Exception($error['message'], 'fopen');
 			}
 		}