diff --git a/dvc/logger.py b/dvc/logger.py
index e51e854ed..108571706 100644
--- a/dvc/logger.py
+++ b/dvc/logger.py
@@ -262,7 +262,9 @@ def _description(message, exception):
     elif message:
         description = "{message}"
     else:
-        raise DvcException('Unexpected error - either exception or message must be provided')
+        raise DvcException(
+            "Unexpected error - either exception or message must be provided"
+        )
 
     return description.format(message=message, exception=exception)
 
diff --git a/dvc/stage.py b/dvc/stage.py
index 1f41384ce..574d3e678 100644
--- a/dvc/stage.py
+++ b/dvc/stage.py
@@ -375,7 +375,9 @@ class Stage(object):
         stage = Stage(project=project, cwd=cwd, cmd=cmd, locked=locked)
 
         stage.outs = output.loads_from(stage, outs, use_cache=True)
-        stage.outs = output.loads_from(stage, metrics, use_cache=True, metric=True)
+        stage.outs += output.loads_from(
+            stage, metrics, use_cache=True, metric=True
+        )
         stage.outs += output.loads_from(stage, outs_no_cache, use_cache=False)
         stage.outs += output.loads_from(
             stage, metrics_no_cache, use_cache=False, metric=True