1 files changed, 6 insertions, 1 deletions
diff --git a/src/new_fields/InkField.ts b/src/new_fields/InkField.ts
index cdb34cedf..49e6bf61e 100644
--- a/src/new_fields/InkField.ts
+++ b/src/new_fields/InkField.ts
@@ -27,5 +27,10 @@ const strokeDataSchema = createSimpleSchema({
 
 export class InkField extends ObjectField {
     @serializable(map(object(strokeDataSchema)))
-    readonly inkData: Map<string, StrokeData> = new Map;
+    readonly inkData: Map<string, StrokeData>;
+
+    constructor(data?: Map<string, StrokeData>) {
+        super();
+        this.inkData = data || new Map;
+    }
 }