SERVER-19262 Split Concurrency test suite into 3:

- Concurrency
- Concurrency_replication
- Concurrency_sharded

1 files changed, 6 insertions, 4 deletions

diff --git a/jstests/concurrency/fsm_libs/worker_thread.js b/jstests/concurrency/fsm_libs/worker_thread.js
index 9276daa88ef..c2e4cb87509 100644
--- a/jstests/concurrency/fsm_libs/worker_thread.js
+++ b/jstests/concurrency/fsm_libs/worker_thread.js
@@ -27,10 +27,12 @@ var workerThread = (function() {
             if (Cluster.isStandalone(args.clusterOptions)) {
                 myDB = db.getSiblingDB(args.dbName);
             } else {
-                // The implicit database connection created within the thread's scope
-                // is unneeded, so forcibly clean it up
-                db = null;
-                gc();
+                if (typeof db !== 'undefined') {
+                    // The implicit database connection created within the thread's scope
+                    // is unneeded, so forcibly clean it up.
+                    db = null;
+                    gc();
+                }
 
                 myDB = new Mongo(args.host).getDB(args.dbName);
             }