2 files changed, 7 insertions, 1 deletions

diff --git a/cgit.c b/cgit.c
index 66dd140..5816f3d 100644
--- a/cgit.c
+++ b/cgit.c
@@ -174,12 +174,15 @@ void config_cb(const char *name, const char *value)
         } else if (!strcmp(name, "include"))
                 parse_configfile(value, config_cb);
 }
 
 static void querystring_cb(const char *name, const char *value)
 {
+        if (!value)
+                value = "";
+
         if (!strcmp(name,"r")) {
                 ctx.qry.repo = xstrdup(value);
                 ctx.repo = cgit_get_repoinfo(value);
         } else if (!strcmp(name, "p")) {
                 ctx.qry.page = xstrdup(value);
         } else if (!strcmp(name, "url")) {
diff --git a/ui-tag.c b/ui-tag.c
index a9c8670..c2d72af 100644
--- a/ui-tag.c
+++ b/ui-tag.c
@@ -34,13 +34,16 @@ void cgit_print_tag(char *revname)
 {
         unsigned char sha1[20];
         struct object *obj;
         struct tag *tag;
         struct taginfo *info;
 
-        if (get_sha1(revname, sha1)) {
+        if (!revname)
+                revname = ctx.qry.head;
+
+        if (get_sha1(fmt("refs/tags/%s", revname), sha1)) {
                 cgit_print_error(fmt("Bad tag reference: %s", revname));
                 return;
         }
         obj = parse_object(sha1);
         if (!obj) {
                 cgit_print_error(fmt("Bad object id: %s", sha1_to_hex(sha1)));