diff --git a/src/applications/audit/storage/PhabricatorAuditTransactionComment.php b/src/applications/audit/storage/PhabricatorAuditTransactionComment.php
--- a/src/applications/audit/storage/PhabricatorAuditTransactionComment.php
+++ b/src/applications/audit/storage/PhabricatorAuditTransactionComment.php
@@ -81,4 +81,8 @@
     return $this;
   }
 
+  public function isEmptyInlineComment() {
+    return !strlen($this->getContent());
+  }
+
 }
diff --git a/src/applications/differential/storage/DifferentialTransactionComment.php b/src/applications/differential/storage/DifferentialTransactionComment.php
--- a/src/applications/differential/storage/DifferentialTransactionComment.php
+++ b/src/applications/differential/storage/DifferentialTransactionComment.php
@@ -127,4 +127,8 @@
     return $this;
   }
 
+  public function isEmptyInlineComment() {
+    return !strlen($this->getContent());
+  }
+
 }
diff --git a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
--- a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
+++ b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
@@ -5033,7 +5033,12 @@
 
     $xactions = array();
 
-    foreach ($inlines as $inline) {
+    foreach ($inlines as $key => $inline) {
+      if ($inline->isEmptyInlineComment()) {
+        unset($inlines[$key]);
+        continue;
+      }
+
       $xactions[] = $object->getApplicationTransactionTemplate()
         ->setTransactionType($transaction_type)
         ->attachComment($inline);
@@ -5079,6 +5084,13 @@
 
     $inlines = array_mergev($inlines);
 
+    foreach ($inlines as $key => $inline) {
+      if ($inline->isEmptyInlineComment()) {
+        unset($inlines[$key]);
+        continue;
+      }
+    }
+
     if (!$inlines) {
       return null;
     }