diff --git a/src/display/text_layer.js b/src/display/text_layer.js
index bf674bcb3..5d43cdc0c 100644
--- a/src/display/text_layer.js
+++ b/src/display/text_layer.js
@@ -224,6 +224,8 @@ function render(task) {
 }
 
 class TextLayerRenderTask {
+  #initialContainer = null;
+
   constructor({
     textContent,
     textContentStream,
@@ -235,6 +237,7 @@ class TextLayerRenderTask {
     this._textContent = textContent;
     this._textContentStream = textContentStream;
     this._container = container;
+    this.#initialContainer = container;
     this._document = container.ownerDocument;
     this._viewport = viewport;
     this._textDivs = textDivs || [];
@@ -318,7 +321,13 @@ class TextLayerRenderTask {
           }
           parent.append(this._container);
         } else if (item.type === "endMarkedContent") {
-          this._container = this._container.parentNode;
+          const parent = this._container.parentNode;
+          if (!parent || this._container === this.#initialContainer) {
+            // Handle unbalanced beginMarkedContent/endMarkedContent operators
+            // (fixes issue15629.pdf).
+            continue;
+          }
+          this._container = parent;
         }
         continue;
       }
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index dd308124f..087061baa 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -302,6 +302,7 @@
 !issue5751.pdf
 !bug893730.pdf
 !bug864847.pdf
+!issue15629.pdf
 !issue1002.pdf
 !issue925.pdf
 !issue2840.pdf
diff --git a/test/pdfs/issue15629.pdf b/test/pdfs/issue15629.pdf
new file mode 100644
index 000000000..d7e98a71a
Binary files /dev/null and b/test/pdfs/issue15629.pdf differ
diff --git a/test/test_manifest.json b/test/test_manifest.json
index c782b5efa..081e5994d 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -2263,6 +2263,12 @@
        "rounds": 1,
        "type": "eq"
     },
+    {  "id": "issue15629",
+       "file": "pdfs/issue15629.pdf",
+       "md5": "689771b7f5c86c783c56aa8dedab0057",
+       "rounds": 1,
+       "type": "text"
+    },
     {  "id": "glyph_accent",
        "file": "pdfs/glyph_accent.pdf",
        "md5": "1526e4edaa3ec439ebf156d0a0b385aa",