diff --git a/src/Commands/core/MigrateRunnerCommands.php b/src/Commands/core/MigrateRunnerCommands.php
index 798714c102..0592d740ef 100644
--- a/src/Commands/core/MigrateRunnerCommands.php
+++ b/src/Commands/core/MigrateRunnerCommands.php
@@ -651,7 +651,7 @@ public function fieldsSource(string $migrationId, $options = ['format' => 'table
         foreach ($source->fields() as $machineName => $description) {
             $table[] = [
                 'machine_name' => $machineName,
-                'description' => strip_tags($description),
+                'description' => strip_tags((string) $description),
             ];
         }
         return new RowsOfFields($table);