diff --git a/blazy.module b/blazy.module
index 6227427a1f9894189f2b5943af4966adf7779c50..86bfcf9589199325303d8d32247088e1725555de 100644
--- a/blazy.module
+++ b/blazy.module
@@ -95,7 +95,7 @@ function blazy_preprocess_media_oembed_iframe(array &$variables) {
 function blazy_preprocess_field(array &$variables) {
   $element = $variables['element'];
   $formatter = $element['#formatter'] ?? 'null';
-  $blazy = strpos($formatter, 'blazy') !== FALSE;
+  $blazy = strpos((string) $formatter, 'blazy') !== FALSE;
 
   if ($blazy || isset($element['#blazy'])
     || !empty($element['#third_party_settings']['blazy']['blazy'])) {
diff --git a/modules/blazy_layout/blazy_layout.module b/modules/blazy_layout/blazy_layout.module
index f1e0cf23d887e6dc87b65d0fdec8b7a1069d6618..67501772f24c52ae389413925d3a36dd4e48b652 100644
--- a/modules/blazy_layout/blazy_layout.module
+++ b/modules/blazy_layout/blazy_layout.module
@@ -196,7 +196,7 @@ function blazy_layout_preprocess_block(array &$variables) {
 function blazy_layout_preprocess_field(array &$variables) {
   $element = &$variables['element'];
   $formatter = $element['#formatter'] ?? 'null';
-  $blazy = strpos($formatter, 'blazy') !== FALSE;
+  $blazy = strpos((string) $formatter, 'blazy') !== FALSE;
 
   if ($blazy || isset($element['#blazy'])
     || !empty($element['#third_party_settings']['blazy']['blazy'])) {