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-rw-r--r--buildstream/plugin.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/buildstream/plugin.py b/buildstream/plugin.py
index 4514ee355..a65db4d42 100644
--- a/buildstream/plugin.py
+++ b/buildstream/plugin.py
@@ -508,6 +508,7 @@ class Plugin():
project = self._get_project()
if project._warning_is_fatal(warning_token):
+ detail = detail if detail else ""
raise PluginError(message="{}\n{}".format(brief, detail), reason=warning_token)
self.__message(MessageType.WARN, brief=brief, detail=detail)