diff --git a/src/wp-admin/includes/plugin-install.php b/src/wp-admin/includes/plugin-install.php
index 6c06e604aa..c89591e0de 100644
--- a/src/wp-admin/includes/plugin-install.php
+++ b/src/wp-admin/includes/plugin-install.php
@@ -457,7 +457,11 @@ function install_plugin_information() {
 	echo "</div>\n";
 
 	$date_format = __( 'M j, Y @ H:i' );
-	$last_updated_timestamp = strtotime( $api->last_updated );
+
+	if ( ! empty( $api->last_updated ) ) {
+		$last_updated_timestamp = strtotime( $api->last_updated );
+	}
+
 	?>
 	<div id="<?php echo $_tab; ?>-content" class='<?php echo $_with_banner; ?>'>
 	<div class="fyi">