diff --git a/src/utils/decodeYrc.js b/src/utils/decodeYrc.js
index c80e6f2..50d775c 100644
--- a/src/utils/decodeYrc.js
+++ b/src/utils/decodeYrc.js
@@ -4,13 +4,12 @@
  * @returns {[number,number,[[number,number],string,number,number][]]}
  */
 export function decodeYrc(i) {
-  let x = 0;
   return i
     .trim()
     .split("\n")
     .filter((it) => it != "[ch:0]")
-    .map((i) => {
-      const line = i.split(/\[([0-9]+),([0-9]+)\](.+)/).slice(1, -1);
+    .map((rawLine, lineIndex) => {
+      const line = rawLine.split(/\[([0-9]+),([0-9]+)\](.+)/).slice(1, -1);
       const start = parseInt(line[0]);
       const dur = parseInt(line[1]);
       let frame = [];
@@ -18,24 +17,26 @@ export function decodeYrc(i) {
       let y = 0;
       if (line[2] == undefined) {
         return;
-      }
+      };
+      if (line.every((it) => it == undefined)) {
+        return;
+      };
       line[2]
         .split(/(\([0-9]+,[0-9]+,[0-9]+\))/)
         .slice(1)
-        .forEach((it) => {
+        .forEach((it, rowIndex) => {
           if (frame.length == 0) {
             const ir = it.split(/\(([0-9]+),([0-9]+),[0-9]+\)/).slice(1, -1);
             frame.push([parseInt(ir[0]), parseInt(ir[1])]);
             return;
-          }
+          };
           frame.push(it.replace(' '," "));
-          frame.push(x);
-          frame.push(y);
-          y += 1;
+          frame.push(lineIndex);
+          frame.push(rowIndex);
           stack.push(frame);
           frame = [];
         });
-      x += 1;
       return [start, dur, stack];
-    });
+    })
+    .filter((i) => i != undefined);
 }