1 files changed, 4 insertions, 0 deletions
diff --git a/lib/url.c b/lib/url.c
index 7f42474c4..46aee6650 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -214,6 +214,8 @@ CURLcode Curl_close(struct SessionHandle *data)
 {
   struct Curl_multi *m = data->multi;
 
+  data->magic = 0; /* force a clear */
+
   if(m)
     /* This handle is still part of a multi handle, take care of this first
        and detach this handle from there. */
@@ -374,6 +376,8 @@ CURLcode Curl_open(struct SessionHandle **curl)
     /* this is a very serious error */
     return CURLE_OUT_OF_MEMORY;
 
+  data->magic = CURLEASY_MAGIC_NUMBER;
+
 #ifdef USE_ARES
   if(ARES_SUCCESS != ares_init(&data->state.areschannel)) {
     free(data);