diff --git a/Jenkinsfile b/Jenkinsfile
index e844420e079..fcf8c2ac8b0 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -1343,7 +1343,7 @@ def loadConfigEnvVars(){
   env.BUILD_ON_MACOS = (params.macosTest                  // UI Input parameter is set to true
                         || !isPR()                        // For branches and tags
                         || matchesPrLabel(label: 'macOS') // If `macOS` GH label (Case-Sensitive)
-                        || (env.GITHUB_COMMENT?.toLowerCase().contains('/test macos'))) // If `/test macos` in the GH comment (Case-Insensitive)
+                        || (env.GITHUB_COMMENT?.toLowerCase()?.contains('/test macos'))) // If `/test macos` in the GH comment (Case-Insensitive)
 }
 
 /**