diff --git a/lib/support/metricsFilter.js b/lib/support/metricsFilter.js
index 91d9d7d491..7d64712f66 100644
--- a/lib/support/metricsFilter.js
+++ b/lib/support/metricsFilter.js
@@ -47,6 +47,7 @@ export function filterMetrics(json, metricPaths) {
         result
       );
     } else {
+      let branch = get(json, branchPath);
       let branchPath = path.slice(0, Math.max(0, firstWildcard));
       if (branchPath.endsWith('.')) branchPath = branchPath.slice(0, -1);