diff --git a/lib/workers/branch/index.js b/lib/workers/branch/index.js
index 7185c8ced6dd6196ca7d0d0018f32617413df29b..9d9588bd746f4649e00a201430faca9a2651f25e 100644
--- a/lib/workers/branch/index.js
+++ b/lib/workers/branch/index.js
@@ -153,15 +153,12 @@ async function processBranch(branchConfig) {
           content +=
             'you rename then delete this PR unmerged, so that it can be regenerated.';
         }
-        content += '\n\nThe output from `stderr` is included below:';
-        const subtopics = [];
+        content += '\n\nThe output from `stderr` is included below:\n\n';
         config.lockFileErrors.forEach(error => {
-          subtopics.push({
-            topic: error.lockFile,
-            content: `\`\`\`\n${error.stderr}\n\`\`\``,
-          });
+          content += `##### ${error.lockFile}\n\n`;
+          content += `\`\`\`\n${error.stderr}\n\`\`\`\n\n`;
         });
-        await platform.ensureComment(pr.number, topic, content, subtopics);
+        await platform.ensureComment(pr.number, topic, content);
       } else {
         await platform.ensureCommentRemoval(pr.number, topic);
         const prAutomerged = await prWorker.checkAutoMerge(pr, config);
diff --git a/lib/workers/branch/yarn.js b/lib/workers/branch/yarn.js
index 7f7109490e1a6bedab72a701b9509a2f4979e83f..a6cc44c88b4828811e8054efb43e99727d26cfe7 100644
--- a/lib/workers/branch/yarn.js
+++ b/lib/workers/branch/yarn.js
@@ -75,8 +75,6 @@ async function generateLockFile(tmpDir) {
     logger.info(
       {
         err,
-        stdout,
-        stderr,
       },
       'yarn install error'
     );