diff --git a/app/models/git_repository.rb b/app/models/git_repository.rb
index e94c1faa1..3b873f8a1 100644
--- a/app/models/git_repository.rb
+++ b/app/models/git_repository.rb
@@ -1,4 +1,7 @@
 # frozen_string_literal: true
+
+require 'tempfile'
+
 # Responsible for all git knowledge of a repo
 # Caches a local mirror (not a full checkout) and creates a workspace when deploying
 class GitRepository
@@ -184,13 +187,17 @@ def instance_cache(key)
   # success: stdout as string
   # error: nil
   def capture_stdout(*command, dir: repo_cache_dir)
-    success, output = Samson::CommandExecutor.execute(
-      *command,
-      whitelist_env: ['HOME', 'PATH'],
-      timeout: 30.minutes,
-      err: '/dev/null',
-      dir: dir
-    )
-    output.strip if success
+    Tempfile.new('git-stderr') do |error_file|
+      success, output = Samson::CommandExecutor.execute(
+        *command,
+        whitelist_env: ['HOME', 'PATH'],
+        timeout: 30.minutes,
+        err: error_file.path,
+        dir: dir
+      )
+      Rails.logger.error("Failed to run command #{command}: #{error_file.read}") unless success
+
+      output.strip if success
+    end
   end
 end