diff --git a/server/postgres/src/utils.ts b/server/postgres/src/utils.ts
index 39b2bb4a0e..e4a5679e5a 100644
--- a/server/postgres/src/utils.ts
+++ b/server/postgres/src/utils.ts
@@ -307,6 +307,12 @@ export function inferType (val: any): string {
     }
   }
   if (typeof val === 'object') {
+    if (val == null) {
+      return ''
+    }
+    if (val instanceof Date) {
+      return '::text'
+    }
     return '::jsonb'
   }
   return ''