diff --git a/src/lbdecision.cc b/src/lbdecision.cc
index a5c334e..2005585 100644
--- a/src/lbdecision.cc
+++ b/src/lbdecision.cc
@@ -572,9 +572,11 @@ LBDecision::get_new_weights(LBData &data, LBRule &rule)
 	    w_iter->second = 0.; //zero out previous weight
 	    ++w_iter;
 	  }
+	  weights.insert(pair<string,float>(iter->first,iter->second));
+	  group = iter->second;
+	} else {
+	  weights.insert(pair<string,float>(iter->first,0.));
 	}
-	weights.insert(pair<string,float>(iter->first,iter->second));
-	group = iter->second;
       }
       else {
 	weights.insert(pair<string,float>(iter->first,0.));