From ec0bd121db9b01d5906f03171ecb40dd8fd7401b Mon Sep 17 00:00:00 2001
From: Jeroen van Rijn <Kelimion@users.noreply.github.com>
Date: Thu, 17 Sep 2026 16:20:11 +0200
Subject: [PATCH] Fix redecleration error for globals

---
 src/check_decl.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/check_decl.cpp b/src/check_decl.cpp
index 49d695c8a..50a4a7bee 100644
--- a/src/check_decl.cpp
+++ b/src/check_decl.cpp
@@ -1778,7 +1778,8 @@ gb_internal void check_global_variable_decl(CheckerContext *ctx, Entity *e, Ast
 			TokenPos pos = f->token.pos;
 			Type *this_type = base_type(e->type);
 			Type *other_type = base_type(f->type);
-			if (!signature_parameter_similar_enough(this_type, other_type)) {
+			bool type_is_null = (e->type == nullptr || f->type == nullptr);
+			if (type_is_null || !signature_parameter_similar_enough(this_type, other_type)) {
 				error(e->token,
 				      "Foreign entity '%.*s' previously declared elsewhere with a different type\n"
 				      "\tat %s",