diff --git a/editing_helper.module b/editing_helper.module
index d513f52f83cc33890ef0fe1059ae2668ac0278ef..0448cecc5b7501bc3b90f0016ccacc35c4372999 100644
--- a/editing_helper.module
+++ b/editing_helper.module
@@ -76,8 +76,7 @@ function editing_helper_preprocess_block(array &$variables) {
 
   // Check if the block is a field or views block.
   if ($plugin_id) {
-    [$block_type, $block_info, $block_bundle, $block_field] = explode(':', $plugin_id) + [NULL, NULL];
-
+    [$block_type, $block_info, $block_bundle, $block_field] = explode(':', $plugin_id) + [NULL, NULL, NULL, NULL];
     switch ($block_type) {
       case 'block_content':
         $variables["attributes"]["class"][] = "editing-helper-block editing-helper-block-content";