name_len = strlen(name);
                if (len != name_len + 41) {
-                       if (server_capabilities)
-                               free(server_capabilities);
+                       free(server_capabilities);
                        server_capabilities = xstrdup(name + name_len + 1);
                }
 
 static const char *rhost_name;
 static int rhost_len;
 
-static int git_proxy_command_options(const char *var, const char *value)
+static int git_proxy_command_options(const char *var, const char *value,
+               void *cb)
 {
        if (!strcmp(var, "core.gitproxy")) {
                const char *for_pos;
 
                if (git_proxy_command)
                        return 0;
+               if (!value)
+                       return config_error_nonbool(var);
                /* [core]
                 * ;# matches www.kernel.org as well
                 * gitproxy = netcatter-1 for kernel.org
                return 0;
        }
 
-       return git_default_config(var, value);
+       return git_default_config(var, value, cb);
 }
 
 static int git_use_proxy(const char *host)
        rhost_name = host;
        rhost_len = strlen(host);
        git_proxy_command = getenv("GIT_PROXY_COMMAND");
-       git_config(git_proxy_command_options);
+       git_config(git_proxy_command_options, NULL);
        rhost_name = NULL;
        return (git_proxy_command && *git_proxy_command);
 }