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
@@ -172,16 +172,19 @@ void config_cb(const char *name, const char *value)
 		else
 			ctx.repo->readme = xstrdup(fmt("%s/%s", ctx.repo->path, 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")) {
 		ctx.qry.url = xstrdup(value);
 		cgit_parse_url(value);
diff --git a/ui-tag.c b/ui-tag.c
index a9c8670..c2d72af 100644
--- a/ui-tag.c
+++ b/ui-tag.c
@@ -32,17 +32,20 @@ static void print_tag_content(char *buf)
 
 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)));
 		return;
 	}