diff --git a/lilypond.py b/lilypond.py
index 7680d18..b1652d0 100644
--- a/lilypond.py
+++ b/lilypond.py
@@ -17,7 +17,10 @@ def render(user: str, source: str, png: bool = True) -> str:
     tmp.write(bytes(fmt, encoding="utf8"))
     tmp.close()
     if png:
-        subprocess.run(["lilypond", "-d", "preview", "--png", "-dresolution=500", tmp.name], cwd="/tmp")
+        ret = subprocess.run(["lilypond", "-d", "preview", "--png", "-dresolution=500", tmp.name], cwd="/tmp", capture_output=True)
+        if ret.returncode != 0:
+            raise FileNotFoundError(ret.stderr.decode())
+
         return tmp.name + ".preview.png"
 
     subprocess.run(["lilypond", "-d", "preview", "--svg", tmp.name], cwd="/tmp")
diff --git a/routes.py b/routes.py
index 889fb27..02594c0 100644
--- a/routes.py
+++ b/routes.py
@@ -16,7 +16,7 @@ async def route_help(r: Router, client: Client, room: str, event: RoomMessageTex
 
 
 async def route_delete(router: Router, client: Client, room: str, event: RoomMessageText, args: list) -> None:
-    if len(args) == 1:
+    if len(args) == 1: 
         import utils
         import os
 
@@ -35,5 +35,13 @@ async def route_lshow(router: Router, client: Client, room: str, event: RoomMess
     import lilypond
     import utils
     if len(args) == 1:
-        file = lilypond.render("", args[0])
-        await utils.send_png(room, file)
+        try:
+            file = lilypond.render("", args[0])
+            await utils.send_png(room, file)
+        except FileNotFoundError as e:
+            content = {
+                "msgtype": "m.text",
+                "body": f"Couldn't parse LilyPond correctly.\n```{e.args[0]}\n```",
+                "formatted_body": f"Couldn't parse LilyPond correctly.<br><code><pre>{e.args[0]}</pre></code>",
+            }
+            await client.room_send(room, message_type="m.room.message", content=content)