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-rw-r--r--buildstream/_variables.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/buildstream/_variables.py b/buildstream/_variables.py
index 3d84d79e2..b4c920a71 100644
--- a/buildstream/_variables.py
+++ b/buildstream/_variables.py
@@ -87,7 +87,7 @@ class Variables():
token = match.group(0)
varname = match.group(1)
- value = _yaml.node_get(variables, str, varname)
+ value = _yaml.node_get(variables, str, varname, default_value=None)
if value is not None:
# We have to check if the inner string has variables
# and return unmatches for those