Avoid potential error with stack_free

diff --git a/Sources/libMultiMarkdown/stack.c b/Sources/libMultiMarkdown/stack.c
index bae24d62f4f9096c9c055a29554e3f46374130d2..73441e040c9343f39599627b6423f3de50991962 100644 (file)
--- a/Sources/libMultiMarkdown/stack.c
+++ b/Sources/libMultiMarkdown/stack.c
@@ -87,8 +87,10 @@ stack * stack_new(int startingSize) {
 
 /// Free the stack
 void stack_free(stack * s) {
-       free(s->element);
-       free(s);
+       if (s) {
+               free(s->element);
+               free(s);
+       }
 }