diff --git a/cache/binary/tags.go b/cache/binary/tags.go
index 8289a99..939f55a 100644
--- a/cache/binary/tags.go
+++ b/cache/binary/tags.go
@@ -79,7 +79,7 @@ func tagsFromArray(arr []string) element.Tags {
 				panic("missing tag for codepoint")
 			}
 			result[tag.Key] = tag.Value
-		} else if arr[i][0] < 32 {
+		} else if len(arr[i]) > 0 && arr[i][0] < 32 {
 			result[codePointToCommonKey[arr[i][0]]] = arr[i][1:]
 		} else {
 			result[arr[i]] = arr[i+1]