X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fworkers%2FAlignCalcManager.java;h=addb372bd9234a6127ba7dde80803b58163db1e4;hb=c3de0b9d18ff5f445536fd5fc818768e28676367;hp=191e8c7da89e6b3ee42ba81fc99641bc665354db;hpb=f8e603128476ca6e093ea2fc65435d1294978c53;p=jalview.git

diff --git a/src/jalview/workers/AlignCalcManager.java b/src/jalview/workers/AlignCalcManager.java
index 191e8c7..addb372 100644
--- a/src/jalview/workers/AlignCalcManager.java
+++ b/src/jalview/workers/AlignCalcManager.java
@@ -131,8 +131,7 @@ public class AlignCalcManager implements AlignCalcManagerI
     {
       if (inProgress.contains(worker))
       {
-        System.err.println("Implementation error: duplicate run of worker "
-                + worker);
+        return false; // worker is already working, so ask caller to wait around
       }
       else
       {