From 816cafde700e361394fd206b832cd3637254c623 Mon Sep 17 00:00:00 2001
From: Dongdong Tian <seisman.info@gmail.com>
Date: Fri, 22 Mar 2024 15:35:22 +0800
Subject: [PATCH] legend should not accept a list of spec files

---
 pygmt/src/legend.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pygmt/src/legend.py b/pygmt/src/legend.py
index fcf5afac82d..e5a7ebefab0 100644
--- a/pygmt/src/legend.py
+++ b/pygmt/src/legend.py
@@ -8,6 +8,7 @@
     build_arg_list,
     data_kind,
     fmt_docstring,
+    is_nonstr_iter,
     kwargs_to_strings,
     use_alias,
 )
@@ -77,7 +78,8 @@ def legend(self, spec=None, position="JTR+jTR+o0.2c", box="+gwhite+p1p", **kwarg
     with Session() as lib:
         if spec is None:
             specfile = ""
-        elif data_kind(spec) == "file":
+        elif data_kind(spec) == "file" and not is_nonstr_iter(spec):
+            # Is a file but not a list of files
             specfile = spec
         else:
             raise GMTInvalidInput(f"Unrecognized data type: {type(spec)}")