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-rw-r--r--lib/system/threads.nim5
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/system/threads.nim b/lib/system/threads.nim
index 2434ea21e..aaf0164fd 100644
--- a/lib/system/threads.nim
+++ b/lib/system/threads.nim
@@ -393,8 +393,9 @@ proc onThreadDestruction*(handler: proc () {.closure, gcsafe.}) =
   ## A thread is destructed when the ``.thread`` proc returns
   ## normally or when it raises an exception. Note that unhandled exceptions
   ## in a thread nevertheless cause the whole process to die.
-  if threadDestructionHandlers.isNil:
-    threadDestructionHandlers = @[]
+  when not defined(nimNoNilSeqs):
+    if threadDestructionHandlers.isNil:
+      threadDestructionHandlers = @[]
   threadDestructionHandlers.add handler
 
 template afterThreadRuns() =