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-rw-r--r--src/whirligig.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/whirligig.c b/src/whirligig.c
index ea78edb8..2d36839b 100644
--- a/src/whirligig.c
+++ b/src/whirligig.c
@@ -311,7 +311,7 @@ int main(int argc, char *argv[])
pos--;
}
- if ( (ser[pos] == -1) && (ser[pos-1] == -1) ) {
+ if ( (pos > 0) && (ser[pos] == -1) && (ser[pos-1] == -1) ) {
/* Series ready to process */
process_series(win, ser, mat, pos-2);
dump(win, ser, mat, window_len, pos);