1 files changed, 1 insertions, 1 deletions
diff --git a/run-tests.php b/run-tests.php
index fb270f0adf..c6e27e42ea 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -3385,7 +3385,7 @@ function clear_show_test(): void
     // Parallel testing
     global $workerID;
 
-    if (!$workerID) {
+    if (!$workerID && isset($line_length)) {
         // Write over the last line to avoid random trailing chars on next echo
         echo str_repeat(" ", $line_length), "\r";
     }