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-rw-r--r--src/algebra/strap/STAGG-.lsp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/algebra/strap/STAGG-.lsp b/src/algebra/strap/STAGG-.lsp
index 0048a3c3..cb3671d0 100644
--- a/src/algebra/strap/STAGG-.lsp
+++ b/src/algebra/strap/STAGG-.lsp
@@ -104,7 +104,7 @@
|STAGG-;elt;AUsA;6|)
(EXIT (COND
((< |l| 0) (|error| "index out of range"))
- ((NULL (SPADCALL |i| (|getShellEntry| $ 31)))
+ ((NOT (SPADCALL |i| (|getShellEntry| $ 31)))
(SPADCALL
(SPADCALL |x|
(PROG1 |l|