diff --git a/src/applications/herald/adapter/HeraldAdapter.php b/src/applications/herald/adapter/HeraldAdapter.php
--- a/src/applications/herald/adapter/HeraldAdapter.php
+++ b/src/applications/herald/adapter/HeraldAdapter.php
@@ -431,11 +431,13 @@
     $field = $this->getFieldImplementation($field_key);
 
     if (!$field) {
-      throw new Exception(
-        pht(
-          'No field with key "%s" is available to Herald adapter "%s".',
-          $field_key,
-          get_class($this)));
+      $ex = pht(
+              'No field with key "%s" is available to Herald adapter "%s".',
+              $field_key,
+              get_class($this));
+      phlog(pht('An exception occurred executing a Herald rule: "%s" Review '.
+        'the Herald transcripts and correct or disable the rule', $ex));
+      throw new Exception($ex);
     }
 
     return $field;