diff --git a/ci/Jenkinsfile b/ci/Jenkinsfile
index fc7e733..c5ace1a 100644
--- a/ci/Jenkinsfile
+++ b/ci/Jenkinsfile
@@ -182,7 +182,7 @@ def setBuildDescFromFile(fileNameOrPath) {
     currentBuild.description = utils.baseName(fileNameOrPath)
     return
   }
-  if (tokens.build.startsWith('pr')) {
+  if (tokens.build && tokens.build.startsWith('pr')) {
     currentBuild.displayName = tokens.build.replace(/^pr/, 'PR-')
   }
   currentBuild.description = formatMap([