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-rw-r--r--src/nvim/decoration_provider.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/nvim/decoration_provider.c b/src/nvim/decoration_provider.c
index 95e13b4240..14c1238fa4 100644
--- a/src/nvim/decoration_provider.c
+++ b/src/nvim/decoration_provider.c
@@ -174,6 +174,7 @@ void decor_providers_invoke_end(DecorProviders *providers, char **err)
DecorProvider *get_decor_provider(NS ns_id, bool force)
{
+ assert(ns_id > 0);
size_t i;
size_t len = kv_size(decor_providers);
for (i = 0; i < len; i++) {