Issue #3525997 by bakop: Entity reference autocomplete in Paragraph causes SQL...

Issue #3525997 by bakop: Entity reference autocomplete in Paragraph causes SQL error when empty value is submitted

Closes #3525997

src/Element/Select2.php

@@ -246,6 +246,9 @@ class Select2 extends Select {
       'handler' => $element['#selection_handler'],
     ];
     $value = is_array($element['#value']) ? $element['#value'] : [$element['#value']];
+    $value = array_filter($value, function ($v) {
+      return is_numeric($v);
+    });
     return $value ? static::getValidReferenceableEntities($value, $handler_settings) : [];
   }