FIXED: Fix NULL pointer dereference

diff --git a/Sources/libMultiMarkdown/writer.c b/Sources/libMultiMarkdown/writer.c
index 69261b3b8b6ea205dd37f8f42e62473b50748ae4..997d578fa4685c7bcadd6dbbc577ceab6578bed1 100644 (file)
--- a/Sources/libMultiMarkdown/writer.c
+++ b/Sources/libMultiMarkdown/writer.c
@@ -1349,7 +1349,7 @@ token * manual_label_from_header(token * h, const char * source) {
                                break;
                        case PAIR_BRACKET:
                                label = walker;
-                               while(walker->type == PAIR_BRACKET) {
+                               while(walker && walker->type == PAIR_BRACKET) {
                                        walker = walker->prev;
                                        count++;
                                }