diff --git a/src/core/fonts.js b/src/core/fonts.js
index be60e4e28..87e6f7758 100644
--- a/src/core/fonts.js
+++ b/src/core/fonts.js
@@ -2629,7 +2629,7 @@ class Font {
           let glyphName;
           if (this.differences[charCode] !== undefined) {
             glyphName = this.differences[charCode];
-          } else if (baseEncoding[charCode] !== "") {
+          } else if (baseEncoding.length && baseEncoding[charCode] !== "") {
             glyphName = baseEncoding[charCode];
           } else {
             glyphName = StandardEncoding[charCode];
diff --git a/test/pdfs/.gitignore b/test/pdfs/.gitignore
index 49aadc5b7..bc9a1dd8e 100644
--- a/test/pdfs/.gitignore
+++ b/test/pdfs/.gitignore
@@ -12,6 +12,7 @@
 !xref_command_missing.pdf
 !issue1155r.pdf
 !issue2017r.pdf
+!bug1727053.pdf
 !issue2391-1.pdf
 !issue2391-2.pdf
 !issue3214.pdf
diff --git a/test/pdfs/bug1727053.pdf b/test/pdfs/bug1727053.pdf
new file mode 100644
index 000000000..ae97f96ee
Binary files /dev/null and b/test/pdfs/bug1727053.pdf differ
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 3741652e1..39e28e26d 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -242,6 +242,12 @@
       "lastPage": 4,
       "type": "eq"
     },
+    {  "id": "bug1727053",
+       "file": "pdfs/bug1727053.pdf",
+       "md5": "8ed1e52da64000f9fdcb8b732f5a58f8",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "issue3999",
        "file": "pdfs/issue3999.pdf",
        "md5": "0a59cd612e93758aa9f104470f45574b",