From 070d8325801f300585248f31681c62284086e04e Mon Sep 17 00:00:00 2001
From: bjoern <r10s@b44t.com>
Date: Sun, 26 Mar 2023 19:25:23 +0200
Subject: [PATCH] check against null in dc_backup_provider_unref() (#4232)

this is what we're doing in most comparable unref() functions.
---
 deltachat-ffi/src/lib.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/deltachat-ffi/src/lib.rs b/deltachat-ffi/src/lib.rs
index 63d8d52bf..968616a5d 100644
--- a/deltachat-ffi/src/lib.rs
+++ b/deltachat-ffi/src/lib.rs
@@ -4230,6 +4230,10 @@ pub unsafe extern "C" fn dc_backup_provider_wait(provider: *mut dc_backup_provid
 
 #[no_mangle]
 pub unsafe extern "C" fn dc_backup_provider_unref(provider: *mut dc_backup_provider_t) {
+    if provider.is_null() {
+        eprintln!("ignoring careless call to dc_backup_provider_unref()");
+        return;
+    }
     drop(Box::from_raw(provider));
 }