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-rw-r--r--lib/system.nim3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/system.nim b/lib/system.nim
index 89de08c6f..b9ed03ddf 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -1411,7 +1411,8 @@ proc insert*[T](x: var seq[T], item: T, i = 0.Natural) {.noSideEffect.} =
     defaultImpl()
   else:
     when defined(js):
-      {.emit: "`x`[`x`_Idx].splice(`i`, 0, null);".}
+      var it : T
+      {.emit: "`x`[`x`_Idx].splice(`i`, 0, `it`);".}
     else:
       defaultImpl()
   x[i] = item