diff --git a/library/Feeds/Web/FeedViewModeSwitcher.php b/library/Feeds/Web/FeedViewModeSwitcher.php
index f47a3e5..4fc7f62 100644
--- a/library/Feeds/Web/FeedViewModeSwitcher.php
+++ b/library/Feeds/Web/FeedViewModeSwitcher.php
@@ -99,7 +99,7 @@ public function setViewModeParam(string $viewModeParam): self
      */
     public function getViewMode(): string
     {
-        $viewMode = $this->getPopulatedValue($this->getViewModeParam(), $this->getDefaultViewMode());
+        $viewMode = $this->getPopulatedValue($this->getViewModeParam()) ?? $this->getDefaultViewMode();
 
         if (array_key_exists($viewMode, static::$viewModes)) {
             return $viewMode;