diff --git a/lib/core/dialogs/edit-json/edit-json.dialog.html b/lib/core/dialogs/edit-json/edit-json.dialog.html
index 6cb9b3c2cc..9451bf8bde 100644
--- a/lib/core/dialogs/edit-json/edit-json.dialog.html
+++ b/lib/core/dialogs/edit-json/edit-json.dialog.html
@@ -1,6 +1,6 @@
 <h1 mat-dialog-title>{{ title | translate }}</h1>
 <mat-dialog-content>
-    <textarea [(ngModel)]="value" [attr.readonly]="!editable"></textarea>
+    <textarea [(ngModel)]="value" [attr.readonly]="!editable ? true : null"></textarea>
 </mat-dialog-content>
 
 <mat-dialog-actions align="end">