Issue #3504119 by pdureau: TypeError: in_array() in NumberWidget

src/Plugin/UiPatterns/Source/NumberWidget.php

@@ -50,7 +50,11 @@ class NumberWidget extends SourcePluginPropValue {
     // "object" type to all props to "allows deferring rendering in Twig to the
     // render pipeline". Remove it as soon as this weird mechanism is removed
     // from SDC.
-    if (in_array("integer", $this->propDefinition["type"]) && !in_array("number", $this->propDefinition["type"], TRUE)) {
+    $type = $this->propDefinition["type"];
+    if (is_array($type) && in_array("integer", $type) && !in_array("number", $type, TRUE)) {
+      $form['value']['#step'] = 1;
+    }
+    if (is_string($type) && $type === 'integer') {
       $form['value']['#step'] = 1;
     }
     if (isset($this->propDefinition["minimum"])) {