Update CustomQueriesExtension.php

src/CustomQueriesExtension.php

@@ -229,7 +229,7 @@ class CustomQueriesExtension extends SimpleExtension
 
         $tableName = $storage->getContenttypeTablename($contentType);
 
-        if(!$tableName) {
+        if(empty($tableName) || empty(str_replace('bolt_', '', $tableName))) {
             return '';
         }
         $query = 'SELECT id FROM '.$tableName;