1 files changed, 3 insertions, 1 deletions

diff --git a/sway/criteria.c b/sway/criteria.c
index a263485a..d9f09ecc 100644
--- a/sway/criteria.c
+++ b/sway/criteria.c
@@ -472,7 +472,9 @@ struct criteria *criteria_parse(char *raw, char **error_arg) {
                         ++head;
                 }
                 name = calloc(head - namestart + 1, 1);
-                strncpy(name, namestart, head - namestart);
+                if (head != namestart) {
+                        strncpy(name, namestart, head - namestart);
+                }
                 // Parse token value
                 skip_spaces(&head);
                 value = NULL;