diff --git a/lib/waterline/error/index.js b/lib/waterline/error/index.js
index 31c74f4e1..c6230064f 100644
--- a/lib/waterline/error/index.js
+++ b/lib/waterline/error/index.js
@@ -56,7 +56,16 @@ function duckType(err) {
 
     // Dress `unique` rule violations to be consistent with other
     // validation errors.
-    return new WLValidationError(err);
+    const er = new WLValidationError(err);
+    if (er.details === 'Invalid attributes sent to undefined:\n • 0\n' && er.rawMessage) {
+        er.code = err.code;
+        er.details = er.reason = er.rawMessage = err.reason;
+        er.text = JSON.stringify({
+            code: er.code,
+            message: '[Error (' + er.code + ')]: ' + er.details
+        });
+    }
+    return er;
   }
 
   // Unexpected miscellaneous error  (`E_UNKNOWN`)