diff --git a/src/core/evaluator.js b/src/core/evaluator.js
index c906abce5..1600f098a 100644
--- a/src/core/evaluator.js
+++ b/src/core/evaluator.js
@@ -4436,6 +4436,16 @@ class PartialEvaluator {
     let glyphScaleFactors = null;
     let systemFontInfo = null;
     if (fontFile) {
+      if (!(fontFile instanceof BaseStream)) {
+        const msg = `Font file should be a Stream in "${fontName.name}".`;
+
+        if (!this.options.ignoreErrors) {
+          throw new FormatError(msg);
+        }
+        warn(msg);
+        fontFile = new NullStream();
+      }
+
       if (fontFile.dict) {
         const subtypeEntry = fontFile.dict.get("Subtype");
         if (subtypeEntry instanceof Name) {
diff --git a/test/pdfs/issue18941.pdf.link b/test/pdfs/issue18941.pdf.link
new file mode 100644
index 000000000..d2402e740
--- /dev/null
+++ b/test/pdfs/issue18941.pdf.link
@@ -0,0 +1 @@
+https://github.com/user-attachments/files/17473385/21_10_2024_FAMI.INVERSION.SAS_901060703_inicial.pdf
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 749cdf6c8..38698ad8a 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -2352,6 +2352,15 @@
     "lastPage": 3,
     "type": "eq"
   },
+  {
+    "id": "issue18941",
+    "file": "pdfs/issue18941.pdf",
+    "md5": "6288e69c1dd240859c1d49c22a53a5c7",
+    "rounds": 1,
+    "link": true,
+    "lastPage": 1,
+    "type": "eq"
+  },
   {
     "id": "f1040",
     "file": "pdfs/f1040.pdf",