SERVER-74674 Fix type checking getDB in feature_flag_util.js

(cherry picked from commit 7b4c5da7b605e6194524ddd3488c5c175886d94c)

1 files changed, 7 insertions, 1 deletions

diff --git a/jstests/libs/feature_flag_util.js b/jstests/libs/feature_flag_util.js
index 4ebb5ef23be..62f2b74f123 100644
--- a/jstests/libs/feature_flag_util.js
+++ b/jstests/libs/feature_flag_util.js
@@ -32,7 +32,13 @@ var FeatureFlagUtil = class {
         } catch (err) {
             // Some db-like objects (e.g. ShardingTest.shard0) aren't supported by FixtureHelpers,
             // but we can replace it with an object that should work and try again.
-            setConn(db.getDB(db.defaultDB));
+            if (typeof db.getDB === typeof Function) {
+                setConn(db.getDB(db.defaultDB));
+            } else {
+                // Some db-like objects (e.g ShardedClusterFixture) have a getSiblingDB method
+                // instead of getDB, use that here to avoid an undefined error.
+                setConn(db.getSiblingDB(db.defaultDB));
+            }
         }
 
         if (user) {