diff --git a/typo3/sysext/core/Classes/Database/Schema/DefaultTcaSchema.php b/typo3/sysext/core/Classes/Database/Schema/DefaultTcaSchema.php
index f815ec4f98544cf17b9392e0211aeb8e6a8c8a6c..afb78963f107bcfe036c9e2ef16cae4f5f79480e 100644
--- a/typo3/sysext/core/Classes/Database/Schema/DefaultTcaSchema.php
+++ b/typo3/sysext/core/Classes/Database/Schema/DefaultTcaSchema.php
@@ -517,7 +517,7 @@ class DefaultTcaSchema
                     $this->quote($fieldName),
                     'json',
                     [
-                        'notnull' => true,
+                        'notnull' => false,
                     ]
                 );
             }