diff --git a/ChangeLog b/ChangeLog
index ba6b50257..326c5a7d0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -79,6 +79,8 @@ Bugfix
    * Fix word size check in in pk.c to not depend on MBEDTLS_HAVE_INT64.
    * Add size-checks for record and handshake message content, securing
      fragile yet non-exploitable code-paths.
+   * Fix crash when calling mbedtls_ssl_cache_free() twice. Found by
+     MilenkoMitrovic, #1104
 
 Changes
    * Extend cert_write example program by options to set the CRT version
diff --git a/library/ssl_cache.c b/library/ssl_cache.c
index 711bc535c..14e350e54 100644
--- a/library/ssl_cache.c
+++ b/library/ssl_cache.c
@@ -321,6 +321,7 @@ void mbedtls_ssl_cache_free( mbedtls_ssl_cache_context *cache )
 #if defined(MBEDTLS_THREADING_C)
     mbedtls_mutex_free( &cache->mutex );
 #endif
+    cache->chain = NULL;
 }
 
 #endif /* MBEDTLS_SSL_CACHE_C */