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Fix detach -a by skipping clients where the session is NULL.
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@ -71,7 +71,8 @@ cmd_detach_client_exec(struct cmd *self, struct cmd_q *cmdq)
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if (args_has(args, 'a')) {
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for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
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c2 = ARRAY_ITEM(&clients, i);
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if (c2 == NULL || c == c2)
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if (c2 == NULL || c2->session == NULL ||
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c2 == c)
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continue;
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server_write_client(c2, msgtype,
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c2->session->name,
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