diff --git a/src/DiscourseAPI.php b/src/DiscourseAPI.php
index 3de972b..86c9a11 100644
--- a/src/DiscourseAPI.php
+++ b/src/DiscourseAPI.php
@@ -1014,7 +1014,7 @@ private function _putpostRequest(
 			if ( isset( $paramArray['group'] ) && is_array( $paramArray['group'] ) ) {
 				$query = http_build_query( $paramArray );
 			} else {
-				if ( is_array( $paramArray[0] ) ) {
+				if ( isset( $paramArray[0] ) && is_array( $paramArray[0] ) ) {
 					foreach ( $paramArray[0] as $param => $value ) {
 						$query .= $param . '=' . urlencode( $value ) . '&';
 					}
@@ -1305,4 +1305,4 @@ public function getTopTopics( string $period = 'yearly', string $userName = 'sys
 
 		return $res;
 	}
-}
\ No newline at end of file
+}