diff --git a/src/core/jpx.js b/src/core/jpx.js
index 4269338c20384..d6583ff99f20b 100644
--- a/src/core/jpx.js
+++ b/src/core/jpx.js
@@ -392,6 +392,9 @@ var JpxImage = (function JpxImageClosure() {
               length = tile.dataEnd - position;
               parseTilePackets(context, data, position, length);
               break;
+            case 0xff53: // Coding style component (COC)
+              warn("JPX: Codestream code 0xFF53 (COC) is not implemented.");
+            /* falls through */
             case 0xff55: // Tile-part lengths, main header (TLM)
             case 0xff57: // Packet length, main header (PLM)
             case 0xff58: // Packet length, tile-part header (PLT)
@@ -399,10 +402,6 @@ var JpxImage = (function JpxImageClosure() {
               length = readUint16(data, position);
               // skipping content
               break;
-            case 0xff53: // Coding style component (COC)
-              throw new Error(
-                "Codestream code 0xFF53 (COC) is not implemented"
-              );
             default:
               throw new Error("Unknown codestream code: " + code.toString(16));
           }
diff --git a/test/pdfs/issue12752.pdf.link b/test/pdfs/issue12752.pdf.link
new file mode 100644
index 0000000000000..f3e2fc0ee430e
--- /dev/null
+++ b/test/pdfs/issue12752.pdf.link
@@ -0,0 +1 @@
+https://github.com/mozilla/pdf.js/files/5715933/WE2330Ausweis_2.pdf
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 1fd7bfa1d7ba9..ccfdaa602d09c 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -2045,6 +2045,14 @@
        "link": true,
        "type": "eq"
     },
+    {  "id": "issue12752",
+       "file": "pdfs/issue12752.pdf",
+       "md5": "9f8ada17a613d18919714baf684e165f",
+       "rounds": 1,
+       "lastPage": 1,
+       "link": true,
+       "type": "eq"
+    },
     {  "id": "issue7872",
        "file": "pdfs/issue7872.pdf",
        "md5": "81781dfecfcb7e9cd9cc7e60f8b747b7",