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-rw-r--r--src/evaluate.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/evaluate.c b/src/evaluate.c
index c04cb91d..70adb847 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -1357,7 +1357,7 @@ static int expr_evaluate_concat(struct eval_ctx *ctx, struct expr **expr)
dsize = key->len;
bo = key->byteorder;
off--;
- } else if (dtype == NULL) {
+ } else if (dtype == NULL || off == 0) {
tmp = datatype_lookup(TYPE_INVALID);
} else {
tmp = concat_subtype_lookup(type, --off);