diff --git a/MathRestbaseInterface.php b/MathRestbaseInterface.php
index d2eef4f30..c8b18343d 100644
--- a/MathRestbaseInterface.php
+++ b/MathRestbaseInterface.php
@@ -401,10 +401,12 @@ class MathRestbaseInterface {
 			}
 			return $response['body'];
 		}
+		// Remove "convenience" duplicate keys put in place by MultiHttpClient
+		unset( $response[0], $response[1], $response[2], $response[3], $response[4] );
 		$this->log()->error( 'Restbase math server problem:', [
 			'request' => $request,
 			'response' => $response,
-			'type' => $type,
+			'math_type' => $type,
 			'tex' => $this->tex
 		] );
 		throw new MWException( "Cannot get $type. Server problem." );