diff --git a/lib/experimental/script-modules.php b/lib/experimental/script-modules.php
index b514e6f16b0ca..7ca14e43d715b 100644
--- a/lib/experimental/script-modules.php
+++ b/lib/experimental/script-modules.php
@@ -243,7 +243,7 @@ function gutenberg_print_script_module_data(): void {
 		 */
 		$data = apply_filters( "scriptmoduledata_{$module_id}", array() );
 
-		if ( ! empty( $data ) ) {
+		if ( is_array( $data ) && ! empty( $data ) ) {
 			/*
 			 * This data will be printed as JSON inside a script tag like this:
 			 *   <script type="application/json"></script>