diff --git a/server/models/Document.ts b/server/models/Document.ts
index 68cdd5565539..c7f5220171b2 100644
--- a/server/models/Document.ts
+++ b/server/models/Document.ts
@@ -228,6 +228,10 @@ class Document extends ParanoidModel {
   @Column(DataType.TEXT)
   text: string;
 
+  @Length({
+    max: DocumentValidation.maxStateLength,
+    msg: `Document collaborative state is too large, you must create a new document`,
+  })
   @Column(DataType.BLOB)
   state: Uint8Array;
 
diff --git a/shared/validations.ts b/shared/validations.ts
index efa510239ef4..6bdd74f70ba0 100644
--- a/shared/validations.ts
+++ b/shared/validations.ts
@@ -30,6 +30,9 @@ export const CollectionValidation = {
 export const DocumentValidation = {
   /** The maximum length of the document title */
   maxTitleLength: 100,
+
+  /** The maximum size of the collaborative document state */
+  maxStateLength: 1000000,
 };
 
 export const PinValidation = {