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-rw-r--r--util/async.lua4
1 files changed, 2 insertions, 2 deletions
diff --git a/util/async.lua b/util/async.lua
index ece589cb..2830238f 100644
--- a/util/async.lua
+++ b/util/async.lua
@@ -73,7 +73,7 @@ local function runner_continue(thread)
return true;
end
-local function waiter(num)
+local function waiter(num, allow_many)
local thread = checkthread();
num = num or 1;
local waiting;
@@ -85,7 +85,7 @@ local function waiter(num)
num = num - 1;
if num == 0 and waiting then
runner_continue(thread);
- elseif num < 0 then
+ elseif not allow_many and num < 0 then
error("done() called too many times");
end
end;