diff --git a/php/src/ContainerDefinitionFetcher.php b/php/src/ContainerDefinitionFetcher.php
index 5628c83767d..8f7c6a97576 100644
--- a/php/src/ContainerDefinitionFetcher.php
+++ b/php/src/ContainerDefinitionFetcher.php
@@ -250,7 +250,7 @@ private function GetDefinition(): array
             }
 
             $enableNvidiaGpu = false;
-            if (is_bool($entry['enable_nvidia_gpu'])) {
+            if (isset($entry['enable_nvidia_gpu'])) {
                 $enableNvidiaGpu = $entry['enable_nvidia_gpu'];
             }