1 files changed, 9 insertions, 1 deletions
diff --git a/lib/memdebug.c b/lib/memdebug.c
index 2ae203d60..5f274b728 100644
--- a/lib/memdebug.c
+++ b/lib/memdebug.c
@@ -200,7 +200,15 @@ FILE *curl_fopen(const char *file, const char *mode,
 
 int curl_fclose(FILE *file, int line, const char *source)
 {
-  int res=(fclose)(file);
+  int res;
+
+  if(NULL == file) {
+    fprintf(stderr, "ILLEGAL flose() on NULL at %s:%d\n",
+            source, line);
+    exit(2);
+  }
+
+  res=(fclose)(file);
   if(logfile)
     fprintf(logfile, "FILE %s:%d fclose(%p)\n",
             source, line, file);